4157645 has 4 divisors (see below), whose sum is σ = 4989180. Its totient is φ = 3326112.

The previous prime is 4157623. The next prime is 4157663. The reversal of 4157645 is 5467514.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1901641 + 2256004 = 1379^2 + 1502^2 .

It is a cyclic number.

It is not a de Polignac number, because 4157645 - 2²⁰ = 3109069 is a prime.

It is a super-3 number, since 3×4157645³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415760 + ... + 415769.

It is an arithmetic number, because the mean of its divisors is an integer number (1247295).

Almost surely, 2^4157645 is an apocalyptic number.

It is an amenable number.

4157645 is a deficient number, since it is larger than the sum of its proper divisors (831535).

4157645 is an equidigital number, since it uses as much as digits as its factorization.

4157645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831534.

The product of its digits is 16800, while the sum is 32.

The square root of 4157645 is about 2039.0304068356. The cubic root of 4157645 is about 160.7986758676.

The spelling of 4157645 in words is "four million, one hundred fifty-seven thousand, six hundred forty-five".