77412139 has 4 divisors (see below), whose sum is σ = 88471024. Its totient is φ = 66353256.

The previous prime is 77412121. The next prime is 77412151. The reversal of 77412139 is 93121477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77412139 - 2⁷ = 77412011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77442139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5529432 + ... + 5529445.

It is an arithmetic number, because the mean of its divisors is an integer number (22117756).

Almost surely, 2^77412139 is an apocalyptic number.

77412139 is a deficient number, since it is larger than the sum of its proper divisors (11058885).

77412139 is a wasteful number, since it uses less digits than its factorization.

77412139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11058884.

The product of its digits is 10584, while the sum is 34.

The square root of 77412139 is about 8798.4168462286. The cubic root of 77412139 is about 426.1897715919.

The spelling of 77412139 in words is "seventy-seven million, four hundred twelve thousand, one hundred thirty-nine".