39940968455 has 4 divisors (see below), whose sum is σ = 47929162152. Its totient is φ = 31952774760.

The previous prime is 39940968443. The next prime is 39940968469. The reversal of 39940968455 is 55486904993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55486904993 = 13 ⋅4268223461.

It is not a de Polignac number, because 39940968455 - 2⁶ = 39940968391 is a prime.

It is a super-2 number, since 2×39940968455² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3994096841 + ... + 3994096850.

It is an arithmetic number, because the mean of its divisors is an integer number (11982290538).

Almost surely, 2^39940968455 is an apocalyptic number.

39940968455 is a deficient number, since it is larger than the sum of its proper divisors (7988193697).

39940968455 is an equidigital number, since it uses as much as digits as its factorization.

39940968455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7988193696.

The product of its (nonzero) digits is 41990400, while the sum is 62.

The spelling of 39940968455 in words is "thirty-nine billion, nine hundred forty million, nine hundred sixty-eight thousand, four hundred fifty-five".