40169997 has 24 divisors (see below), whose sum is σ = 70214976. Its totient is φ = 21603456.

The previous prime is 40169993. The next prime is 40170043. The reversal of 40169997 is 79996104.

It is not a de Polignac number, because 40169997 - 2² = 40169993 is a prime.

It is a super-2 number, since 2×40169997² = 3227257317960018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40169993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17683 + ... + 19824.

It is an arithmetic number, because the mean of its divisors is an integer number (2925624).

Almost surely, 2^40169997 is an apocalyptic number.

It is an amenable number.

40169997 is a deficient number, since it is larger than the sum of its proper divisors (30044979).

40169997 is a wasteful number, since it uses less digits than its factorization.

40169997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37537 (or 37534 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 40169997 is about 6337.9805143279. The cubic root of 40169997 is about 342.4789892452.

The spelling of 40169997 in words is "forty million, one hundred sixty-nine thousand, nine hundred ninety-seven".