40181944 has 16 divisors (see below), whose sum is σ = 82190520. Its totient is φ = 18264480.

The previous prime is 40181923. The next prime is 40181957. The reversal of 40181944 is 44918104.

It is a super-2 number, since 2×40181944² = 3229177247238272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228219 + ... + 228394.

Almost surely, 2^40181944 is an apocalyptic number.

40181944 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40181944 is an abundant number, since it is smaller than the sum of its proper divisors (42008576).

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

40181944 is a wasteful number, since it uses less digits than its factorization.

40181944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456630 (or 456626 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 40181944 is about 6338.9229369034. The cubic root of 40181944 is about 342.5129382222.

The spelling of 40181944 in words is "forty million, one hundred eighty-one thousand, nine hundred forty-four".