1392421357 has 4 divisors (see below), whose sum is σ = 1452961440. Its totient is φ = 1331881276.

The previous prime is 1392421343. The next prime is 1392421361. The reversal of 1392421357 is 7531242931.

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 1392421357 - 2¹¹ = 1392419309 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 (1392421337) 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, 30270007 + ... + 30270052.

It is an arithmetic number, because the mean of its divisors is an integer number (363240360).

Almost surely, 2^1392421357 is an apocalyptic number.

It is an amenable number.

1392421357 is a deficient number, since it is larger than the sum of its proper divisors (60540083).

1392421357 is an equidigital number, since it uses as much as digits as its factorization.

1392421357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60540082.

The product of its digits is 45360, while the sum is 37.

The square root of 1392421357 is about 37315.1625616183. The cubic root of 1392421357 is about 1116.6666828940. Note that the first 4 decimals are identical.

The spelling of 1392421357 in words is "one billion, three hundred ninety-two million, four hundred twenty-one thousand, three hundred fifty-seven".