3969217538 has 16 divisors (see below), whose sum is σ = 6994705536. Its totient is φ = 1665405840.

The previous prime is 3969217529. The next prime is 3969217543. The reversal of 3969217538 is 8357129693.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3969217538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6938906 + ... + 6939477.

It is an arithmetic number, because the mean of its divisors is an integer number (437169096).

Almost surely, 2^3969217538 is an apocalyptic number.

3969217538 is a deficient number, since it is larger than the sum of its proper divisors (3025487998).

3969217538 is a wasteful number, since it uses less digits than its factorization.

3969217538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13878409.

The product of its digits is 2449440, while the sum is 53.

The square root of 3969217538 is about 63001.7264684072. The cubic root of 3969217538 is about 1583.3185521599.

The spelling of 3969217538 in words is "three billion, nine hundred sixty-nine million, two hundred seventeen thousand, five hundred thirty-eight".