1379696921 has 4 divisors (see below), whose sum is σ = 1399129344. Its totient is φ = 1360264500.

The previous prime is 1379696909. The next prime is 1379696947. The reversal of 1379696921 is 1296969731.

It is a happy number.

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 1379696921 - 2¹⁰ = 1379695897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379696221) 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, 9716105 + ... + 9716246.

It is an arithmetic number, because the mean of its divisors is an integer number (349782336).

Almost surely, 2^1379696921 is an apocalyptic number.

It is an amenable number.

1379696921 is a deficient number, since it is larger than the sum of its proper divisors (19432423).

1379696921 is an equidigital number, since it uses as much as digits as its factorization.

1379696921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19432422.

The product of its digits is 1102248, while the sum is 53.

The square root of 1379696921 is about 37144.2717117997. The cubic root of 1379696921 is about 1113.2547710011.

The spelling of 1379696921 in words is "one billion, three hundred seventy-nine million, six hundred ninety-six thousand, nine hundred twenty-one".