2157922 has 8 divisors (see below), whose sum is σ = 3485916. Its totient is φ = 995952.

The previous prime is 2157913. The next prime is 2157923. The reversal of 2157922 is 2297512.

It can be written as a sum of positive squares in 2 ways, for example, as 2128681 + 29241 = 1459^2 + 171^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2⁶ + 1 + 5⁴ + 7 + 9⁵ + 2¹⁰ + 2²¹ .

It is not an unprimeable number, because it can be changed into a prime (2157923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41473 + ... + 41524.

2^2157922 is an apocalyptic number.

2157922 is a deficient number, since it is larger than the sum of its proper divisors (1327994).

2157922 is a wasteful number, since it uses less digits than its factorization.

2157922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83012.

The product of its digits is 2520, while the sum is 28.

The square root of 2157922 is about 1468.9867256037. The cubic root of 2157922 is about 129.2246151824.

It can be divided in two parts, 2 and 157922, that multiplied together give a square (315844 = 562²).

The spelling of 2157922 in words is "two million, one hundred fifty-seven thousand, nine hundred twenty-two".