1372521 has 4 divisors (see below), whose sum is σ = 1830032. Its totient is φ = 915012.

The previous prime is 1372493. The next prime is 1372531. The reversal of 1372521 is 1252731.

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: 1252731 = 3 ⋅417577.

It is not a de Polignac number, because 1372521 - 2¹³ = 1364329 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1372531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228751 + ... + 228756.

It is an arithmetic number, because the mean of its divisors is an integer number (457508).

2^1372521 is an apocalyptic number.

It is an amenable number.

1372521 is a deficient number, since it is larger than the sum of its proper divisors (457511).

1372521 is an equidigital number, since it uses as much as digits as its factorization.

1372521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457510.

The product of its digits is 420, while the sum is 21.

The square root of 1372521 is about 1171.5464139333. The cubic root of 1372521 is about 111.1321370950.

The spelling of 1372521 in words is "one million, three hundred seventy-two thousand, five hundred twenty-one".