1392391111 has 4 divisors (see below), whose sum is σ = 1392513472. Its totient is φ = 1392268752.

The previous prime is 1392391109. The next prime is 1392391139. The reversal of 1392391111 is 1111932931.

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 1392391111 - 2¹ = 1392391109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392331111) 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, 42135 + ... + 67528.

It is an arithmetic number, because the mean of its divisors is an integer number (348128368).

Almost surely, 2^1392391111 is an apocalyptic number.

1392391111 is a deficient number, since it is larger than the sum of its proper divisors (122361).

1392391111 is a wasteful number, since it uses less digits than its factorization.

1392391111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122360.

The product of its digits is 1458, while the sum is 31.

The square root of 1392391111 is about 37314.7572818047. The cubic root of 1392391111 is about 1116.6585974715.

The spelling of 1392391111 in words is "one billion, three hundred ninety-two million, three hundred ninety-one thousand, one hundred eleven".