3972493657 has 16 divisors (see below), whose sum is σ = 4361542848. Its totient is φ = 3588167680.

The previous prime is 3972493607. The next prime is 3972493661. The reversal of 3972493657 is 7563942793.

It is a cyclic number.

It is not a de Polignac number, because 3972493657 - 2⁷ = 3972493529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3972493598 and 3972493607.

It is not an unprimeable number, because it can be changed into a prime (3972493607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1441593 + ... + 1444345.

It is an arithmetic number, because the mean of its divisors is an integer number (272596428).

Almost surely, 2^3972493657 is an apocalyptic number.

It is an amenable number.

3972493657 is a deficient number, since it is larger than the sum of its proper divisors (389049191).

3972493657 is a wasteful number, since it uses less digits than its factorization.

3972493657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3560.

The product of its digits is 8573040, while the sum is 55.

The square root of 3972493657 is about 63027.7213375194. The cubic root of 3972493657 is about 1583.7540463493.

The spelling of 3972493657 in words is "three billion, nine hundred seventy-two million, four hundred ninety-three thousand, six hundred fifty-seven".