1391392077 has 4 divisors (see below), whose sum is σ = 1855189440. Its totient is φ = 927594716.

The previous prime is 1391392043. The next prime is 1391392109. The reversal of 1391392077 is 7702931931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1391392077 - 2⁸ = 1391391821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391392027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231898677 + ... + 231898682.

It is an arithmetic number, because the mean of its divisors is an integer number (463797360).

Almost surely, 2^1391392077 is an apocalyptic number.

It is an amenable number.

1391392077 is a deficient number, since it is larger than the sum of its proper divisors (463797363).

1391392077 is an equidigital number, since it uses as much as digits as its factorization.

1391392077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463797362.

The product of its (nonzero) digits is 71442, while the sum is 42.

The square root of 1391392077 is about 37301.3682992997. The cubic root of 1391392077 is about 1116.3914678289.

The spelling of 1391392077 in words is "one billion, three hundred ninety-one million, three hundred ninety-two thousand, seventy-seven".