1392776989 has 4 divisors (see below), whose sum is σ = 1393174080. Its totient is φ = 1392379900.

The previous prime is 1392776981. The next prime is 1392776993. The reversal of 1392776989 is 9896772931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9896772931 = 311 ⋅31822421.

It is a cyclic number.

It is not a de Polignac number, because 1392776989 - 2³ = 1392776981 is a prime.

It is a super-2 number, since 2×1392776989² = 3879655482175812242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392776981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193237 + ... + 200314.

It is an arithmetic number, because the mean of its divisors is an integer number (348293520).

Almost surely, 2^1392776989 is an apocalyptic number.

It is an amenable number.

1392776989 is a deficient number, since it is larger than the sum of its proper divisors (397091).

1392776989 is an equidigital number, since it uses as much as digits as its factorization.

1392776989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397090.

The product of its digits is 10287648, while the sum is 61.

The square root of 1392776989 is about 37319.9275052886. The cubic root of 1392776989 is about 1116.7617423862.

The spelling of 1392776989 in words is "one billion, three hundred ninety-two million, seven hundred seventy-six thousand, nine hundred eighty-nine".