40139812868 has 6 divisors (see below), whose sum is σ = 70244672526. Its totient is φ = 20069906432.

The previous prime is 40139812861. The next prime is 40139812943. The reversal of 40139812868 is 86821893104.

It can be written as a sum of positive squares in only one way, i.e., 36495517444 + 3644295424 = 191038^2 + 60368^2 .

It is a super-2 number, since 2×40139812868² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40139812861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5017476605 + ... + 5017476612.

It is an arithmetic number, because the mean of its divisors is an integer number (11707445421).

Almost surely, 2^40139812868 is an apocalyptic number.

It is an amenable number.

40139812868 is a deficient number, since it is larger than the sum of its proper divisors (30104859658).

40139812868 is a wasteful number, since it uses less digits than its factorization.

40139812868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10034953221 (or 10034953219 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The spelling of 40139812868 in words is "forty billion, one hundred thirty-nine million, eight hundred twelve thousand, eight hundred sixty-eight".