40131397 has 2 divisors, whose sum is σ = 40131398. Its totient is φ = 40131396.

The previous prime is 40131379. The next prime is 40131409. The reversal of 40131397 is 79313104.

Together with previous prime (40131379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39614436 + 516961 = 6294^2 + 719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40131397 is a prime.

It is a super-2 number, since 2×40131397² = 3221058050343218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40131307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20065698 + 20065699.

It is an arithmetic number, because the mean of its divisors is an integer number (20065699).

Almost surely, 2^40131397 is an apocalyptic number.

It is an amenable number.

40131397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40131397 is an equidigital number, since it uses as much as digits as its factorization.

40131397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 40131397 is about 6334.9346484396. The cubic root of 40131397 is about 342.3692562224.

The spelling of 40131397 in words is "forty million, one hundred thirty-one thousand, three hundred ninety-seven".