1897730820 has 72 divisors (see below), whose sum is σ = 5760553344. Its totient is φ = 505700928.

The previous prime is 1897730789. The next prime is 1897730837. The reversal of 1897730820 is 280377981.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333237 + ... + 338883.

Almost surely, 2^1897730820 is an apocalyptic number.

1897730820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897730820 is an abundant number, since it is smaller than the sum of its proper divisors (3862822524).

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

1897730820 is a wasteful number, since it uses less digits than its factorization.

1897730820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7529 (or 7524 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1897730820 is about 43562.9523792867. The cubic root of 1897730820 is about 1238.0690593699.

The spelling of 1897730820 in words is "one billion, eight hundred ninety-seven million, seven hundred thirty thousand, eight hundred twenty".