40687161 has 16 divisors (see below), whose sum is σ = 58141824. Its totient is φ = 25242624.

The previous prime is 40687139. The next prime is 40687187. The reversal of 40687161 is 16178604.

It is a happy number.

It is not a de Polignac number, because 40687161 - 2¹⁸ = 40425017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40680161) 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, 5416 + ... + 10521.

It is an arithmetic number, because the mean of its divisors is an integer number (3633864).

Almost surely, 2^40687161 is an apocalyptic number.

It is an amenable number.

40687161 is a deficient number, since it is larger than the sum of its proper divisors (17454663).

40687161 is a wasteful number, since it uses less digits than its factorization.

40687161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16000.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40687161 is about 6378.6488381161. The cubic root of 40687161 is about 343.9424620956.

The spelling of 40687161 in words is "forty million, six hundred eighty-seven thousand, one hundred sixty-one".