1372639 has 4 divisors (see below), whose sum is σ = 1406160. Its totient is φ = 1339120.

The previous prime is 1372633. The next prime is 1372661. The reversal of 1372639 is 9362731.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1372639 - 2⁵ = 1372607 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 1372639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1372633) 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, 16699 + ... + 16780.

It is an arithmetic number, because the mean of its divisors is an integer number (351540).

2^1372639 is an apocalyptic number.

1372639 is a deficient number, since it is larger than the sum of its proper divisors (33521).

1372639 is an equidigital number, since it uses as much as digits as its factorization.

1372639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33520.

The product of its digits is 6804, while the sum is 31.

The square root of 1372639 is about 1171.5967736384. The cubic root of 1372639 is about 111.1353217983.

The spelling of 1372639 in words is "one million, three hundred seventy-two thousand, six hundred thirty-nine".