2157704 has 8 divisors (see below), whose sum is σ = 4045710. Its totient is φ = 1078848.

The previous prime is 2157679. The next prime is 2157709. The reversal of 2157704 is 4077512.

It can be written as a sum of positive squares in only one way, i.e., 1435204 + 722500 = 1198^2 + 850^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2157709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134849 + ... + 134864.

2^2157704 is an apocalyptic number.

It is an amenable number.

2157704 is a deficient number, since it is larger than the sum of its proper divisors (1888006).

2157704 is a wasteful number, since it uses less digits than its factorization.

2157704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269719 (or 269715 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 2157704 is about 1468.9125229230. The cubic root of 2157704 is about 129.2202634782.

The spelling of 2157704 in words is "two million, one hundred fifty-seven thousand, seven hundred four".