1392152221 has 8 divisors (see below), whose sum is σ = 1443607200. Its totient is φ = 1340927280.

The previous prime is 1392152213. The next prime is 1392152231. The reversal of 1392152221 is 1222512931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1392152221 - 2³ = 1392152213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1392152221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392152231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45135 + ... + 69436.

It is an arithmetic number, because the mean of its divisors is an integer number (180450900).

Almost surely, 2^1392152221 is an apocalyptic number.

It is an amenable number.

1392152221 is a deficient number, since it is larger than the sum of its proper divisors (51454979).

1392152221 is a wasteful number, since it uses less digits than its factorization.

1392152221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115019.

The product of its digits is 2160, while the sum is 28.

The square root of 1392152221 is about 37311.5561321154. The cubic root of 1392152221 is about 1116.5947327935.

The spelling of 1392152221 in words is "one billion, three hundred ninety-two million, one hundred fifty-two thousand, two hundred twenty-one".