2145657 has 8 divisors (see below), whose sum is σ = 2927584. Its totient is φ = 1397088.

The previous prime is 2145643. The next prime is 2145677. The reversal of 2145657 is 7565412.

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

It is not a de Polignac number, because 2145657 - 2⁴ = 2145641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8188 + ... + 8445.

It is an arithmetic number, because the mean of its divisors is an integer number (365948).

2^2145657 is an apocalyptic number.

It is an amenable number.

2145657 is a deficient number, since it is larger than the sum of its proper divisors (781927).

2145657 is a wasteful number, since it uses less digits than its factorization.

2145657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16679.

The product of its digits is 8400, while the sum is 30.

The square root of 2145657 is about 1464.8061305169. The cubic root of 2145657 is about 128.9793248519.

The spelling of 2145657 in words is "two million, one hundred forty-five thousand, six hundred fifty-seven".