3991258 has 4 divisors (see below), whose sum is σ = 5986890. Its totient is φ = 1995628.

The previous prime is 3991237. The next prime is 3991261. The reversal of 3991258 is 8521993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3988009 + 3249 = 1997^2 + 57^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997813 + ... + 997816.

Almost surely, 2^3991258 is an apocalyptic number.

3991258 is a deficient number, since it is larger than the sum of its proper divisors (1995632).

3991258 is a wasteful number, since it uses less digits than its factorization.

3991258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995631.

The product of its digits is 19440, while the sum is 37.

The square root of 3991258 is about 1997.8133045908. The cubic root of 3991258 is about 158.6243786824.

The spelling of 3991258 in words is "three million, nine hundred ninety-one thousand, two hundred fifty-eight".