1371639 has 4 divisors (see below), whose sum is σ = 1828856. Its totient is φ = 914424.

The previous prime is 1371619. The next prime is 1371641. The reversal of 1371639 is 9361731.

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

It is not a de Polignac number, because 1371639 - 2⁵ = 1371607 is a prime.

It is a D-number.

It is a Duffinian number.

1371639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1371619) 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, 228604 + ... + 228609.

It is an arithmetic number, because the mean of its divisors is an integer number (457214).

2^1371639 is an apocalyptic number.

1371639 is a deficient number, since it is larger than the sum of its proper divisors (457217).

1371639 is an equidigital number, since it uses as much as digits as its factorization.

1371639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457216.

The product of its digits is 3402, while the sum is 30.

The square root of 1371639 is about 1171.1699278926. The cubic root of 1371639 is about 111.1083270043.

The spelling of 1371639 in words is "one million, three hundred seventy-one thousand, six hundred thirty-nine".