2157404 has 6 divisors (see below), whose sum is σ = 3775464. Its totient is φ = 1078700.

The previous prime is 2157401. The next prime is 2157413. The reversal of 2157404 is 4047512.

2157404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2157404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157401) by changing a digit.

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, 269672 + ... + 269679.

It is an arithmetic number, because the mean of its divisors is an integer number (629244).

2^2157404 is an apocalyptic number.

It is an amenable number.

2157404 is a deficient number, since it is larger than the sum of its proper divisors (1618060).

2157404 is a wasteful number, since it uses less digits than its factorization.

2157404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539355 (or 539353 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 2157404 is about 1468.8104030133. The cubic root of 2157404 is about 129.2142744152.

The spelling of 2157404 in words is "two million, one hundred fifty-seven thousand, four hundred four".