2156439 has 4 divisors (see below), whose sum is σ = 2875256. Its totient is φ = 1437624.

The previous prime is 2156437. The next prime is 2156447. The reversal of 2156439 is 9346512.

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

It is not a de Polignac number, because 2156439 - 2¹ = 2156437 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156437) 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, 359404 + ... + 359409.

It is an arithmetic number, because the mean of its divisors is an integer number (718814).

2^2156439 is an apocalyptic number.

2156439 is a deficient number, since it is larger than the sum of its proper divisors (718817).

2156439 is an equidigital number, since it uses as much as digits as its factorization.

2156439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718816.

The product of its digits is 6480, while the sum is 30.

The square root of 2156439 is about 1468.4818691424. The cubic root of 2156439 is about 129.1950058296.

The spelling of 2156439 in words is "two million, one hundred fifty-six thousand, four hundred thirty-nine".