2156406 has 16 divisors (see below), whose sum is σ = 4929024. Its totient is φ = 616104.

The previous prime is 2156393. The next prime is 2156417. The reversal of 2156406 is 6046512.

2156406 is nontrivially palindromic in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25630 + ... + 25713.

It is an arithmetic number, because the mean of its divisors is an integer number (308064).

2^2156406 is an apocalyptic number.

2156406 is an abundant number, since it is smaller than the sum of its proper divisors (2772618).

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

2156406 is a wasteful number, since it uses less digits than its factorization.

2156406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51355.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2156406 is about 1468.4706330056. The cubic root of 2156406 is about 129.1943468022.

The spelling of 2156406 in words is "two million, one hundred fifty-six thousand, four hundred six".