1274639 has 4 divisors (see below), whose sum is σ = 1277856. Its totient is φ = 1271424.

The previous prime is 1274633. The next prime is 1274671. The reversal of 1274639 is 9364721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9364721 = 2551 ⋅3671.

It is a cyclic number.

It is not a de Polignac number, because 1274639 - 2²⁰ = 226063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1274633) 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, 914 + ... + 1839.

It is an arithmetic number, because the mean of its divisors is an integer number (319464).

2^1274639 is an apocalyptic number.

1274639 is a deficient number, since it is larger than the sum of its proper divisors (3217).

1274639 is an equidigital number, since it uses as much as digits as its factorization.

1274639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216.

The product of its digits is 9072, while the sum is 32.

The square root of 1274639 is about 1128.9991142601. Note that the first 3 decimals coincide. The cubic root of 1274639 is about 108.4249092868.

The spelling of 1274639 in words is "one million, two hundred seventy-four thousand, six hundred thirty-nine".