1379521 has 12 divisors (see below), whose sum is σ = 1634836. Its totient is φ = 1156320.

The previous prime is 1379519. The next prime is 1379549. The reversal of 1379521 is 1259731.

It is the 480-th star number.

It can be written as a sum of positive squares in 2 ways, for example, as 680625 + 698896 = 825^2 + 836^2 .

It is not a de Polignac number, because 1379521 - 2¹ = 1379519 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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 1379521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1135 + ... + 2011.

2^1379521 is an apocalyptic number.

1379521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1379521 is a deficient number, since it is larger than the sum of its proper divisors (255315).

1379521 is a wasteful number, since it uses less digits than its factorization.

1379521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912 (or 901 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 1379521 is about 1174.5301188135. The cubic root of 1379521 is about 111.3207453069.

The spelling of 1379521 in words is "one million, three hundred seventy-nine thousand, five hundred twenty-one".