40157969 has 2 divisors, whose sum is σ = 40157970. Its totient is φ = 40157968.

The previous prime is 40157959. The next prime is 40157981. The reversal of 40157969 is 96975104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40157569 + 400 = 6337^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 40157969 - 2⁸ = 40157713 is a prime.

It is a super-2 number, since 2×40157969² = 3225324948409922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40157939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20078984 + 20078985.

It is an arithmetic number, because the mean of its divisors is an integer number (20078985).

Almost surely, 2^40157969 is an apocalyptic number.

It is an amenable number.

40157969 is a deficient number, since it is larger than the sum of its proper divisors (1).

40157969 is an equidigital number, since it uses as much as digits as its factorization.

40157969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 40157969 is about 6337.0315605968. The cubic root of 40157969 is about 342.4448032954. Note that the first 3 decimals are identical.

The spelling of 40157969 in words is "forty million, one hundred fifty-seven thousand, nine hundred sixty-nine".