40404157 has 2 divisors, whose sum is σ = 40404158. Its totient is φ = 40404156.

The previous prime is 40404139. The next prime is 40404173. The reversal of 40404157 is 75140404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28611801 + 11792356 = 5349^2 + 3434^2 .

It is a cyclic number.

It is not a de Polignac number, because 40404157 - 2¹⁵ = 40371389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40404457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202078 + 20202079.

It is an arithmetic number, because the mean of its divisors is an integer number (20202079).

Almost surely, 2^40404157 is an apocalyptic number.

It is an amenable number.

40404157 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404157 is an equidigital number, since it uses as much as digits as its factorization.

40404157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 40404157 is about 6356.4264331462. The cubic root of 40404157 is about 343.1431628746.

The spelling of 40404157 in words is "forty million, four hundred four thousand, one hundred fifty-seven".