381868440 has 32 divisors (see below), whose sum is σ = 1145605680. Its totient is φ = 101831552.

The previous prime is 381868439. The next prime is 381868489. The reversal of 381868440 is 44868183.

It is a junction number, because it is equal to n+sod(n) for n = 381868392 and 381868401.

It is a congruent number.

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, 1590999 + ... + 1591238.

Almost surely, 2^381868440 is an apocalyptic number.

381868440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381868440 is an abundant number, since it is smaller than the sum of its proper divisors (763737240).

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

381868440 is a wasteful number, since it uses less digits than its factorization.

381868440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3182251 (or 3182247 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 381868440 is about 19541.4543982785. The cubic root of 381868440 is about 725.5008445729.

The spelling of 381868440 in words is "three hundred eighty-one million, eight hundred sixty-eight thousand, four hundred forty".