3921993497 has 4 divisors (see below), whose sum is σ = 3945478656. Its totient is φ = 3898508340.

The previous prime is 3921993431. The next prime is 3921993503. The reversal of 3921993497 is 7943991293.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3921993497 - 2¹⁴ = 3921977113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921993697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11742329 + ... + 11742662.

It is an arithmetic number, because the mean of its divisors is an integer number (986369664).

Almost surely, 2^3921993497 is an apocalyptic number.

It is an amenable number.

3921993497 is a deficient number, since it is larger than the sum of its proper divisors (23485159).

3921993497 is a wasteful number, since it uses less digits than its factorization.

3921993497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23485158.

The product of its digits is 3306744, while the sum is 56.

The square root of 3921993497 is about 62625.8213279475. The cubic root of 3921993497 is about 1577.0142696791.

The spelling of 3921993497 in words is "three billion, nine hundred twenty-one million, nine hundred ninety-three thousand, four hundred ninety-seven".