1392449621 has 2 divisors, whose sum is σ = 1392449622. Its totient is φ = 1392449620.

The previous prime is 1392449609. The next prime is 1392449633. The reversal of 1392449621 is 1269442931.

It is a balanced prime because it is at equal distance from previous prime (1392449609) and next prime (1392449633).

It can be written as a sum of positive squares in only one way, i.e., 1380122500 + 12327121 = 37150^2 + 3511^2 .

It is an emirp because it is prime and its reverse (1269442931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1392449621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1392449221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696224810 + 696224811.

It is an arithmetic number, because the mean of its divisors is an integer number (696224811).

Almost surely, 2^1392449621 is an apocalyptic number.

It is an amenable number.

1392449621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1392449621 is an equidigital number, since it uses as much as digits as its factorization.

1392449621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 1392449621 is about 37315.5412797403. The cubic root of 1392449621 is about 1116.6742383784.

The spelling of 1392449621 in words is "one billion, three hundred ninety-two million, four hundred forty-nine thousand, six hundred twenty-one".