77126939 has 2 divisors, whose sum is σ = 77126940. Its totient is φ = 77126938.

The previous prime is 77126927. The next prime is 77126963. The reversal of 77126939 is 93962177.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93962177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77126939 - 2¹⁶ = 77061403 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77126939.

It is not a weakly prime, because it can be changed into another prime (77126239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38563469 + 38563470.

It is an arithmetic number, because the mean of its divisors is an integer number (38563470).

Almost surely, 2^77126939 is an apocalyptic number.

77126939 is a deficient number, since it is larger than the sum of its proper divisors (1).

77126939 is an equidigital number, since it uses as much as digits as its factorization.

77126939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 77126939 is about 8782.1944296400. The cubic root of 77126939 is about 425.6657413798.

The spelling of 77126939 in words is "seventy-seven million, one hundred twenty-six thousand, nine hundred thirty-nine".