381553872 has 80 divisors (see below), whose sum is σ = 1154009472. Its totient is φ = 106352640.

The previous prime is 381553867. The next prime is 381553889. The reversal of 381553872 is 278355183.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73 + ... + 27624.

Almost surely, 2^381553872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381553872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577004736).

381553872 is an abundant number, since it is smaller than the sum of its proper divisors (772455600).

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

381553872 is a wasteful number, since it uses less digits than its factorization.

381553872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27756 (or 27750 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 381553872 is about 19533.4040044228. The cubic root of 381553872 is about 725.3015769539.

The spelling of 381553872 in words is "three hundred eighty-one million, five hundred fifty-three thousand, eight hundred seventy-two".