381963915 has 12 divisors (see below), whose sum is σ = 662070864. Its totient is φ = 203714064.

The previous prime is 381963899. The next prime is 381963917. The reversal of 381963915 is 519369183.

381963915 is a `hidden beast` number, since 3 + 8 + 1 + 9 + 639 + 1 + 5 = 666.

It is not a de Polignac number, because 381963915 - 2⁴ = 381963899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 8488087 = 381963915 / (3 + 8 + 1 + 9 + 6 + 3 + 9 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (381963917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4243999 + ... + 4244088.

It is an arithmetic number, because the mean of its divisors is an integer number (55172572).

Almost surely, 2^381963915 is an apocalyptic number.

381963915 is a deficient number, since it is larger than the sum of its proper divisors (280106949).

381963915 is a wasteful number, since it uses less digits than its factorization.

381963915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488098 (or 8488095 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 381963915 is about 19543.8971292831. The cubic root of 381963915 is about 725.5613029349.

The spelling of 381963915 in words is "three hundred eighty-one million, nine hundred sixty-three thousand, nine hundred fifteen".