381039864 has 32 divisors (see below), whose sum is σ = 953272320. Its totient is φ = 126923616.

The previous prime is 381039863. The next prime is 381039907. The reversal of 381039864 is 468930183.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381039863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35139 + ... + 44685.

It is an arithmetic number, because the mean of its divisors is an integer number (29789760).

Almost surely, 2^381039864 is an apocalyptic number.

It is an amenable number.

381039864 is an abundant number, since it is smaller than the sum of its proper divisors (572232456).

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

381039864 is a wasteful number, since it uses less digits than its factorization.

381039864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11219 (or 11215 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 381039864 is about 19520.2424165275. The cubic root of 381039864 is about 724.9757353750.

The spelling of 381039864 in words is "three hundred eighty-one million, thirty-nine thousand, eight hundred sixty-four".