3969697640 has 16 divisors (see below), whose sum is σ = 8931819780. Its totient is φ = 1587879040.

The previous prime is 3969697631. The next prime is 3969697679. The reversal of 3969697640 is 467969693.

It can be written as a sum of positive squares in 2 ways, for example, as 3800229316 + 169468324 = 61646^2 + 13018^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3969697640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49621181 + ... + 49621260.

Almost surely, 2^3969697640 is an apocalyptic number.

It is an amenable number.

3969697640 is an abundant number, since it is smaller than the sum of its proper divisors (4962122140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3969697640 is a wasteful number, since it uses less digits than its factorization.

3969697640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99242452 (or 99242448 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 59.

The square root of 3969697640 is about 63005.5365821132. The cubic root of 3969697640 is about 1583.3823870552.

The spelling of 3969697640 in words is "three billion, nine hundred sixty-nine million, six hundred ninety-seven thousand, six hundred forty".