2156742 has 24 divisors (see below), whose sum is σ = 5340816. Its totient is φ = 616176.

The previous prime is 2156731. The next prime is 2156753. The reversal of 2156742 is 2476512.

It is an interprime number because it is at equal distance from previous prime (2156731) and next prime (2156753).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8433 + ... + 8684.

It is an arithmetic number, because the mean of its divisors is an integer number (222534).

2^2156742 is an apocalyptic number.

2156742 is an abundant number, since it is smaller than the sum of its proper divisors (3184074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156742 is a wasteful number, since it uses less digits than its factorization.

2156742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17132 (or 17129 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2156742 is about 1468.5850332888. The cubic root of 2156742 is about 129.2010565848.

It can be divided in two parts, 21567 and 42, that added together give a square (21609 = 147²).

The spelling of 2156742 in words is "two million, one hundred fifty-six thousand, seven hundred forty-two".