2156542 has 8 divisors (see below), whose sum is σ = 3276000. Its totient is φ = 1064544.

The previous prime is 2156537. The next prime is 2156597. The reversal of 2156542 is 2456512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6667 + ... + 6982.

It is an arithmetic number, because the mean of its divisors is an integer number (409500).

2^2156542 is an apocalyptic number.

2156542 is a deficient number, since it is larger than the sum of its proper divisors (1119458).

2156542 is a wasteful number, since it uses less digits than its factorization.

2156542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13730.

The product of its digits is 2400, while the sum is 25.

The square root of 2156542 is about 1468.5169389558. The cubic root of 2156542 is about 129.1970627505.

The spelling of 2156542 in words is "two million, one hundred fifty-six thousand, five hundred forty-two".