76929409 has 2 divisors, whose sum is σ = 76929410. Its totient is φ = 76929408.

The previous prime is 76929379. The next prime is 76929421. The reversal of 76929409 is 90492967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57153600 + 19775809 = 7560^2 + 4447^2 .

It is an emirp because it is prime and its reverse (90492967) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76929409 - 2⁹ = 76928897 is a prime.

It is not a weakly prime, because it can be changed into another prime (76929449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38464704 + 38464705.

It is an arithmetic number, because the mean of its divisors is an integer number (38464705).

Almost surely, 2^76929409 is an apocalyptic number.

It is an amenable number.

76929409 is a deficient number, since it is larger than the sum of its proper divisors (1).

76929409 is an equidigital number, since it uses as much as digits as its factorization.

76929409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 76929409 is about 8770.9411695667. The cubic root of 76929409 is about 425.3020395053.

The spelling of 76929409 in words is "seventy-six million, nine hundred twenty-nine thousand, four hundred nine".