40181772 has 12 divisors (see below), whose sum is σ = 93757496. Its totient is φ = 13393920.

The previous prime is 40181767. The next prime is 40181777. The reversal of 40181772 is 27718104.

It is an interprime number because it is at equal distance from previous prime (40181767) and next prime (40181777).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×40181772² = 3229149602119968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40181777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674229 + ... + 1674252.

Almost surely, 2^40181772 is an apocalyptic number.

It is an amenable number.

40181772 is an abundant number, since it is smaller than the sum of its proper divisors (53575724).

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

40181772 is a wasteful number, since it uses less digits than its factorization.

40181772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348488 (or 3348486 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 40181772 is about 6338.9093699153. The cubic root of 40181772 is about 342.5124495093.

Adding to 40181772 its reverse (27718104), we get a palindrome (67899876).

The spelling of 40181772 in words is "forty million, one hundred eighty-one thousand, seven hundred seventy-two".