39969427 has 2 divisors, whose sum is σ = 39969428. Its totient is φ = 39969426.

The previous prime is 39969421. The next prime is 39969451. The reversal of 39969427 is 72496993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 39969427 - 2¹¹ = 39967379 is a prime.

It is not a weakly prime, because it can be changed into another prime (39969421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19984713 + 19984714.

It is an arithmetic number, because the mean of its divisors is an integer number (19984714).

Almost surely, 2^39969427 is an apocalyptic number.

39969427 is a deficient number, since it is larger than the sum of its proper divisors (1).

39969427 is an equidigital number, since it uses as much as digits as its factorization.

39969427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 39969427 is about 6322.1378504427. The cubic root of 39969427 is about 341.9080353025.

The spelling of 39969427 in words is "thirty-nine million, nine hundred sixty-nine thousand, four hundred twenty-seven".