1379759621 has 4 divisors (see below), whose sum is σ = 1383519552. Its totient is φ = 1375999692.

The previous prime is 1379759603. The next prime is 1379759639. The reversal of 1379759621 is 1269579731.

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 an interprime number because it is at equal distance from previous prime (1379759603) and next prime (1379759639).

It is a cyclic number.

It is not a de Polignac number, because 1379759621 - 2¹⁸ = 1379497477 is a prime.

It is a super-2 number, since 2×1379759621² = 3807473223484127282, which contains 22 as substring.

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 1379759621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379750621) 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, 1879415 + ... + 1880148.

It is an arithmetic number, because the mean of its divisors is an integer number (345879888).

Almost surely, 2^1379759621 is an apocalyptic number.

It is an amenable number.

1379759621 is a deficient number, since it is larger than the sum of its proper divisors (3759931).

1379759621 is an equidigital number, since it uses as much as digits as its factorization.

1379759621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759930.

The product of its digits is 714420, while the sum is 50.

The square root of 1379759621 is about 37145.1157085289. The cubic root of 1379759621 is about 1113.2716346122.

The spelling of 1379759621 in words is "one billion, three hundred seventy-nine million, seven hundred fifty-nine thousand, six hundred twenty-one".