381978500 has 24 divisors (see below), whose sum is σ = 834242136. Its totient is φ = 152791200.

The previous prime is 381978479. The next prime is 381978511. The reversal of 381978500 is 5879183.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10876804 + 371101696 = 3298^2 + 19264^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381479 + ... + 382478.

It is an arithmetic number, because the mean of its divisors is an integer number (34760089).

Almost surely, 2^381978500 is an apocalyptic number.

It is an amenable number.

381978500 is an abundant number, since it is smaller than the sum of its proper divisors (452263636).

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

381978500 is a wasteful number, since it uses less digits than its factorization.

381978500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763976 (or 763964 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 381978500 is about 19544.2702601044. The cubic root of 381978500 is about 725.5705378186.

The spelling of 381978500 in words is "three hundred eighty-one million, nine hundred seventy-eight thousand, five hundred".