381557500 has 30 divisors (see below), whose sum is σ = 834395408. Its totient is φ = 152622000.

The previous prime is 381557489. The next prime is 381557581. The reversal of 381557500 is 5755183.

It is a super-2 number, since 2×381557500² = 291172251612500000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 73812 + ... + 78811.

Almost surely, 2^381557500 is an apocalyptic number.

It is an amenable number.

381557500 is an abundant number, since it is smaller than the sum of its proper divisors (452837908).

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

381557500 is a wasteful number, since it uses less digits than its factorization.

381557500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152647 (or 152630 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 381557500 is about 19533.4968707602. The cubic root of 381557500 is about 725.3038757868.

The spelling of 381557500 in words is "three hundred eighty-one million, five hundred fifty-seven thousand, five hundred".