1897232940 has 72 divisors (see below), whose sum is σ = 5780196240. Its totient is φ = 503708544.

The previous prime is 1897232923. The next prime is 1897232941. The reversal of 1897232940 is 492327981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1897232941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18207 + ... + 64233.

Almost surely, 2^1897232940 is an apocalyptic number.

1897232940 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 1897232940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2890098120).

1897232940 is an abundant number, since it is smaller than the sum of its proper divisors (3882963300).

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

1897232940 is a wasteful number, since it uses less digits than its factorization.

1897232940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46271 (or 46266 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1897232940 is about 43557.2375157103. The cubic root of 1897232940 is about 1237.9607785167.

The spelling of 1897232940 in words is "one billion, eight hundred ninety-seven million, two hundred thirty-two thousand, nine hundred forty".