76421399 has 2 divisors, whose sum is σ = 76421400. Its totient is φ = 76421398.

The previous prime is 76421393. The next prime is 76421413. The reversal of 76421399 is 99312467.

It is a weak prime.

It is an emirp because it is prime and its reverse (99312467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76421399 - 2⁴ = 76421383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76421393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38210699 + 38210700.

It is an arithmetic number, because the mean of its divisors is an integer number (38210700).

Almost surely, 2^76421399 is an apocalyptic number.

76421399 is a deficient number, since it is larger than the sum of its proper divisors (1).

76421399 is an equidigital number, since it uses as much as digits as its factorization.

76421399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 76421399 is about 8741.9333673965. The cubic root of 76421399 is about 424.3637982891.

The spelling of 76421399 in words is "seventy-six million, four hundred twenty-one thousand, three hundred ninety-nine".