40072169 has 2 divisors, whose sum is σ = 40072170. Its totient is φ = 40072168.

The previous prime is 40072139. The next prime is 40072177. The reversal of 40072169 is 96127004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30118144 + 9954025 = 5488^2 + 3155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40072169 is a prime.

It is a super-2 number, since 2×40072169² = 3211557456729122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40072139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20036084 + 20036085.

It is an arithmetic number, because the mean of its divisors is an integer number (20036085).

Almost surely, 2^40072169 is an apocalyptic number.

It is an amenable number.

40072169 is a deficient number, since it is larger than the sum of its proper divisors (1).

40072169 is an equidigital number, since it uses as much as digits as its factorization.

40072169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 40072169 is about 6330.2582095836. The cubic root of 40072169 is about 342.2007445191.

The spelling of 40072169 in words is "forty million, seventy-two thousand, one hundred sixty-nine".