3991522 has 8 divisors (see below), whose sum is σ = 6114816. Its totient is φ = 1953252.

The previous prime is 3991517. The next prime is 3991543. The reversal of 3991522 is 2251993.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21138 + ... + 21325.

It is an arithmetic number, because the mean of its divisors is an integer number (764352).

Almost surely, 2^3991522 is an apocalyptic number.

3991522 is a deficient number, since it is larger than the sum of its proper divisors (2123294).

3991522 is a wasteful number, since it uses less digits than its factorization.

3991522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42512.

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

The square root of 3991522 is about 1997.8793757382. The cubic root of 3991522 is about 158.6278759852.

The spelling of 3991522 in words is "three million, nine hundred ninety-one thousand, five hundred twenty-two".