2155404 has 24 divisors (see below), whose sum is σ = 5125680. Its totient is φ = 704704.

The previous prime is 2155397. The next prime is 2155409. The reversal of 2155404 is 4045512.

2155404 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (2155409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1059 + ... + 2330.

It is an arithmetic number, because the mean of its divisors is an integer number (213570).

2^2155404 is an apocalyptic number.

It is an amenable number.

2155404 is an abundant number, since it is smaller than the sum of its proper divisors (2970276).

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

2155404 is a wasteful number, since it uses less digits than its factorization.

2155404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3449 (or 3447 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 2155404 is about 1468.1294220878. The cubic root of 2155404 is about 129.1743331327.

The spelling of 2155404 in words is "two million, one hundred fifty-five thousand, four hundred four".