40139357 has 2 divisors, whose sum is σ = 40139358. Its totient is φ = 40139356.

The previous prime is 40139321. The next prime is 40139371. The reversal of 40139357 is 75393104.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33477796 + 6661561 = 5786^2 + 2581^2 .

It is a cyclic number.

It is not a de Polignac number, because 40139357 - 2⁸ = 40139101 is a prime.

It is a super-2 number, since 2×40139357² = 3222335960746898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40132357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069678 + 20069679.

It is an arithmetic number, because the mean of its divisors is an integer number (20069679).

Almost surely, 2^40139357 is an apocalyptic number.

It is an amenable number.

40139357 is a deficient number, since it is larger than the sum of its proper divisors (1).

40139357 is an equidigital number, since it uses as much as digits as its factorization.

40139357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 40139357 is about 6335.5628794922. The cubic root of 40139357 is about 342.3918908619.

The spelling of 40139357 in words is "forty million, one hundred thirty-nine thousand, three hundred fifty-seven".