1897153440 has 384 divisors, whose sum is σ = 7427427840. Its totient is φ = 398721024.

The previous prime is 1897153411. The next prime is 1897153481. The reversal of 1897153440 is 443517981.

It is a happy number.

1897153440 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1897153392 and 1897153401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7381792 + ... + 7382048.

It is an arithmetic number, because the mean of its divisors is an integer number (19342260).

Almost surely, 2^1897153440 is an apocalyptic number.

1897153440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1897153440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3713713920).

1897153440 is an abundant number, since it is smaller than the sum of its proper divisors (5530274400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1897153440 is a wasteful number, since it uses less digits than its factorization.

1897153440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 287 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1897153440 is about 43556.3249138400. The cubic root of 1897153440 is about 1237.9434867977.

The spelling of 1897153440 in words is "one billion, eight hundred ninety-seven million, one hundred fifty-three thousand, four hundred forty".