3992521 has 8 divisors (see below), whose sum is σ = 4438784. Its totient is φ = 3566160.

The previous prime is 3992519. The next prime is 3992531. The reversal of 3992521 is 1252993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3992521 - 2¹ = 3992519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3992531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4551 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (554848).

Almost surely, 2^3992521 is an apocalyptic number.

3992521 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3992521 is a deficient number, since it is larger than the sum of its proper divisors (446263).

3992521 is a wasteful number, since it uses less digits than its factorization.

3992521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9951.

The product of its digits is 4860, while the sum is 31.

The square root of 3992521 is about 1998.1293751907. The cubic root of 3992521 is about 158.6411087010.

The spelling of 3992521 in words is "three million, nine hundred ninety-two thousand, five hundred twenty-one".