1379921 has 4 divisors (see below), whose sum is σ = 1388352. Its totient is φ = 1371492.

The previous prime is 1379897. The next prime is 1379923. The reversal of 1379921 is 1299731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1299731 = 907 ⋅1433.

It is a cyclic number.

It is not a de Polignac number, because 1379921 - 2⁶ = 1379857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1379923) 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, 3965 + ... + 4298.

It is an arithmetic number, because the mean of its divisors is an integer number (347088).

2^1379921 is an apocalyptic number.

It is an amenable number.

1379921 is a deficient number, since it is larger than the sum of its proper divisors (8431).

1379921 is an equidigital number, since it uses as much as digits as its factorization.

1379921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8430.

The product of its digits is 3402, while the sum is 32.

The square root of 1379921 is about 1174.7003873329. The cubic root of 1379921 is about 111.3315036293.

The spelling of 1379921 in words is "one million, three hundred seventy-nine thousand, nine hundred twenty-one".