2156404 has 6 divisors (see below), whose sum is σ = 3773714. Its totient is φ = 1078200.

The previous prime is 2156393. The next prime is 2156417. The reversal of 2156404 is 4046512.

2156404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1904400 + 252004 = 1380^2 + 502^2 .

It is a super-2 number, since 2×2156404² = 9300156422432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269547 + ... + 269554.

2^2156404 is an apocalyptic number.

It is an amenable number.

2156404 is a deficient number, since it is larger than the sum of its proper divisors (1617310).

2156404 is a wasteful number, since it uses less digits than its factorization.

2156404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539105 (or 539103 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2156404 is about 1468.4699520249. The cubic root of 2156404 is about 129.1943068609.

The spelling of 2156404 in words is "two million, one hundred fifty-six thousand, four hundred four".