39978319 has 2 divisors, whose sum is σ = 39978320. Its totient is φ = 39978318.

The previous prime is 39978311. The next prime is 39978329. The reversal of 39978319 is 91387993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39978319 - 2³ = 39978311 is a prime.

It is a super-2 number, since 2×39978319² = 3196531980131522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39978311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19989159 + 19989160.

It is an arithmetic number, because the mean of its divisors is an integer number (19989160).

Almost surely, 2^39978319 is an apocalyptic number.

39978319 is a deficient number, since it is larger than the sum of its proper divisors (1).

39978319 is an equidigital number, since it uses as much as digits as its factorization.

39978319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 39978319 is about 6322.8410544628. The cubic root of 39978319 is about 341.9333881872.

The spelling of 39978319 in words is "thirty-nine million, nine hundred seventy-eight thousand, three hundred nineteen".