3928491 has 24 divisors (see below), whose sum is σ = 6549504. Its totient is φ = 2222640.

The previous prime is 3928487. The next prime is 3928493. The reversal of 3928491 is 1948293.

It is not a de Polignac number, because 3928491 - 2² = 3928487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3928493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7756 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (272896).

Almost surely, 2^3928491 is an apocalyptic number.

3928491 is a deficient number, since it is larger than the sum of its proper divisors (2621013).

3928491 is a wasteful number, since it uses less digits than its factorization.

3928491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 628 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 3928491 is about 1982.0421287147. The cubic root of 3928491 is about 157.7884660521.

The spelling of 3928491 in words is "three million, nine hundred twenty-eight thousand, four hundred ninety-one".