39690400869 has 144 divisors (see below), whose sum is σ = 74137085568. Its totient is φ = 21102415488.

The previous prime is 39690400861. The next prime is 39690400879. The reversal of 39690400869 is 96800409693.

It is a happy number.

39690400869 is a `hidden beast` number, since 3 + 96 + 90 + 400 + 8 + 69 = 666.

It is not a de Polignac number, because 39690400869 - 2³ = 39690400861 is a prime.

It is a super-2 number, since 2×39690400869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39690400861) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 10130899 + ... + 10134815.

It is an arithmetic number, because the mean of its divisors is an integer number (514840872).

Almost surely, 2^39690400869 is an apocalyptic number.

It is an amenable number.

39690400869 is a deficient number, since it is larger than the sum of its proper divisors (34446684699).

39690400869 is a wasteful number, since it uses less digits than its factorization.

39690400869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006 (or 3987 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 39690400869 in words is "thirty-nine billion, six hundred ninety million, four hundred thousand, eight hundred sixty-nine".