1897402920 has 256 divisors, whose sum is σ = 6848755200. Its totient is φ = 411402240.

The previous prime is 1897402873. The next prime is 1897402921. The reversal of 1897402920 is 292047981.

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

It is not an unprimeable number, because it can be changed into a prime (1897402921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1273536 + ... + 1275024.

It is an arithmetic number, because the mean of its divisors is an integer number (26752950).

Almost surely, 2^1897402920 is an apocalyptic number.

1897402920 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 1897402920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3424377600).

1897402920 is an abundant number, since it is smaller than the sum of its proper divisors (4951352280).

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

1897402920 is a wasteful number, since it uses less digits than its factorization.

1897402920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588 (or 1584 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1897402920 is about 43559.1886976789. The cubic root of 1897402920 is about 1237.9977485490.

The spelling of 1897402920 in words is "one billion, eight hundred ninety-seven million, four hundred two thousand, nine hundred twenty".