3979999 has 2 divisors, whose sum is σ = 3980000. Its totient is φ = 3979998.

The previous prime is 3979981. The next prime is 3980003. The reversal of 3979999 is 9999793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3979999 - 2⁵ = 3979967 is a prime.

3979999 is a modest number, since divided by 9999 gives 397 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3979499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989999 + 1990000.

It is an arithmetic number, because the mean of its divisors is an integer number (1990000).

Almost surely, 2^3979999 is an apocalyptic number.

3979999 is a deficient number, since it is larger than the sum of its proper divisors (1).

3979999 is an equidigital number, since it uses as much as digits as its factorization.

3979999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1240029, while the sum is 55.

The square root of 3979999 is about 1994.9934836986. The cubic root of 3979999 is about 158.4750829085.

The spelling of 3979999 in words is "three million, nine hundred seventy-nine thousand, nine hundred ninety-nine".