1897274880 has 160 divisors (see below), whose sum is σ = 6739524000. Its totient is φ = 505921536.

The previous prime is 1897274861. The next prime is 1897274893. The reversal of 1897274880 is 884727981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 55396 + ... + 82844.

It is an arithmetic number, because the mean of its divisors is an integer number (42122025).

Almost surely, 2^1897274880 is an apocalyptic number.

1897274880 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 1897274880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3369762000).

1897274880 is an abundant number, since it is smaller than the sum of its proper divisors (4842249120).

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

1897274880 is an equidigital number, since it uses as much as digits as its factorization.

1897274880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27481 (or 27459 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 54.

The square root of 1897274880 is about 43557.7189485400. The cubic root of 1897274880 is about 1237.9699005195.

The spelling of 1897274880 in words is "one billion, eight hundred ninety-seven million, two hundred seventy-four thousand, eight hundred eighty".