381173440 has 112 divisors (see below), whose sum is σ = 969995520. Its totient is φ = 142248960.

The previous prime is 381173413. The next prime is 381173449. The reversal of 381173440 is 44371183.

It is a super-2 number, since 2×381173440² = 290586382722867200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (381173449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431239 + ... + 432121.

Almost surely, 2^381173440 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 381173440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (484997760).

381173440 is an abundant number, since it is smaller than the sum of its proper divisors (588822080).

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

381173440 is a wasteful number, since it uses less digits than its factorization.

381173440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990 (or 980 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 381173440 is about 19523.6635906277. The cubic root of 381173440 is about 725.0604404626.

The spelling of 381173440 in words is "three hundred eighty-one million, one hundred seventy-three thousand, four hundred forty".