3951994 has 4 divisors (see below), whose sum is σ = 5927994. Its totient is φ = 1975996.

The previous prime is 3951989. The next prime is 3952009. The reversal of 3951994 is 4991593.

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., 2480625 + 1471369 = 1575^2 + 1213^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987997 + ... + 988000.

Almost surely, 2^3951994 is an apocalyptic number.

3951994 is a deficient number, since it is larger than the sum of its proper divisors (1976000).

3951994 is a wasteful number, since it uses less digits than its factorization.

3951994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975999.

The product of its digits is 43740, while the sum is 40.

The square root of 3951994 is about 1987.9622732839. The cubic root of 3951994 is about 158.1025078539.

The spelling of 3951994 in words is "three million, nine hundred fifty-one thousand, nine hundred ninety-four".