1456639 has 4 divisors (see below), whose sum is σ = 1460160. Its totient is φ = 1453120.

The previous prime is 1456633. The next prime is 1456643. The reversal of 1456639 is 9366541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9366541 = 17 ⋅550973.

It is a cyclic number.

It is not a de Polignac number, because 1456639 - 2⁹ = 1456127 is a prime.

It is a Duffinian number.

1456639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1456633) 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, 1042 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (365040).

2^1456639 is an apocalyptic number.

1456639 is a deficient number, since it is larger than the sum of its proper divisors (3521).

1456639 is an equidigital number, since it uses as much as digits as its factorization.

1456639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520.

The product of its digits is 19440, while the sum is 34.

The square root of 1456639 is about 1206.9130043214. The cubic root of 1456639 is about 113.3576005320.

The spelling of 1456639 in words is "one million, four hundred fifty-six thousand, six hundred thirty-nine".