39870979 has 2 divisors, whose sum is σ = 39870980. Its totient is φ = 39870978.

The previous prime is 39870917. The next prime is 39870989. The reversal of 39870979 is 97907893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39870979 - 2¹³ = 39862787 is a prime.

It is not a weakly prime, because it can be changed into another prime (39870989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19935489 + 19935490.

It is an arithmetic number, because the mean of its divisors is an integer number (19935490).

Almost surely, 2^39870979 is an apocalyptic number.

39870979 is a deficient number, since it is larger than the sum of its proper divisors (1).

39870979 is an equidigital number, since it uses as much as digits as its factorization.

39870979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 52.

The square root of 39870979 is about 6314.3470763017. The cubic root of 39870979 is about 341.6270886008.

The spelling of 39870979 in words is "thirty-nine million, eight hundred seventy thousand, nine hundred seventy-nine".