77399489 has 2 divisors, whose sum is σ = 77399490. Its totient is φ = 77399488.

The previous prime is 77399479. The next prime is 77399507. The reversal of 77399489 is 98499377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70845889 + 6553600 = 8417^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 77399489 - 2¹² = 77395393 is a prime.

It is a super-2 number, since 2×77399489² = 11981361794922242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77399479) 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, 38699744 + 38699745.

It is an arithmetic number, because the mean of its divisors is an integer number (38699745).

Almost surely, 2^77399489 is an apocalyptic number.

It is an amenable number.

77399489 is a deficient number, since it is larger than the sum of its proper divisors (1).

77399489 is an equidigital number, since it uses as much as digits as its factorization.

77399489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 56.

The square root of 77399489 is about 8797.6979375289. The cubic root of 77399489 is about 426.1665556192.

The spelling of 77399489 in words is "seventy-seven million, three hundred ninety-nine thousand, four hundred eighty-nine".