2153642 has 4 divisors (see below), whose sum is σ = 3230466. Its totient is φ = 1076820.

The previous prime is 2153639. The next prime is 2153647. The reversal of 2153642 is 2463512.

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., 1692601 + 461041 = 1301^2 + 679^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2153647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538409 + ... + 538412.

2^2153642 is an apocalyptic number.

2153642 is a deficient number, since it is larger than the sum of its proper divisors (1076824).

2153642 is a wasteful number, since it uses less digits than its factorization.

2153642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076823.

The product of its digits is 1440, while the sum is 23.

The square root of 2153642 is about 1467.5292160635. The cubic root of 2153642 is about 129.1391243854.

The spelling of 2153642 in words is "two million, one hundred fifty-three thousand, six hundred forty-two".