67399939 has 2 divisors, whose sum is σ = 67399940. Its totient is φ = 67399938.

The previous prime is 67399933. The next prime is 67399961. The reversal of 67399939 is 93999376.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67399939 - 2⁷ = 67399811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67399939.

It is not a weakly prime, because it can be changed into another prime (67399933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33699969 + 33699970.

It is an arithmetic number, because the mean of its divisors is an integer number (33699970).

Almost surely, 2^67399939 is an apocalyptic number.

67399939 is a deficient number, since it is larger than the sum of its proper divisors (1).

67399939 is an equidigital number, since it uses as much as digits as its factorization.

67399939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2480058, while the sum is 55.

The square root of 67399939 is about 8209.7465856140. The cubic root of 67399939 is about 406.9613523702.

The spelling of 67399939 in words is "sixty-seven million, three hundred ninety-nine thousand, nine hundred thirty-nine".