2157698 has 4 divisors (see below), whose sum is σ = 3236550. Its totient is φ = 1078848.

The previous prime is 2157679. The next prime is 2157709. The reversal of 2157698 is 8967512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1423249 + 734449 = 1193^2 + 857^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539423 + ... + 539426.

2^2157698 is an apocalyptic number.

2157698 is a deficient number, since it is larger than the sum of its proper divisors (1078852).

2157698 is a wasteful number, since it uses less digits than its factorization.

2157698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078851.

The product of its digits is 30240, while the sum is 38.

The square root of 2157698 is about 1468.9104805944. The cubic root of 2157698 is about 129.2201437024.

The spelling of 2157698 in words is "two million, one hundred fifty-seven thousand, six hundred ninety-eight".