2157642 has 12 divisors (see below), whose sum is σ = 4674930. Its totient is φ = 719208.

The previous prime is 2157641. The next prime is 2157667. The reversal of 2157642 is 2467512.

2157642 is a `hidden beast` number, since 2 + 15 + 7 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1535121 + 622521 = 1239^2 + 789^2 .

It is not an unprimeable number, because it can be changed into a prime (2157641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59917 + ... + 59952.

2^2157642 is an apocalyptic number.

2157642 is an abundant number, since it is smaller than the sum of its proper divisors (2517288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157642 is a wasteful number, since it uses less digits than its factorization.

2157642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119877 (or 119874 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2157642 is about 1468.8914187237. The cubic root of 2157642 is about 129.2190257840.

The spelling of 2157642 in words is "two million, one hundred fifty-seven thousand, six hundred forty-two".