42523645 has 4 divisors (see below), whose sum is σ = 51028380. Its totient is φ = 34018912.

The previous prime is 42523643. The next prime is 42523687. The reversal of 42523645 is 54632524.

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 20602521 + 21921124 = 4539^2 + 4682^2 .

It is a cyclic number.

It is not a de Polignac number, because 42523645 - 2¹ = 42523643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42523643) 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, 4252360 + ... + 4252369.

It is an arithmetic number, because the mean of its divisors is an integer number (12757095).

Almost surely, 2^42523645 is an apocalyptic number.

It is an amenable number.

42523645 is a deficient number, since it is larger than the sum of its proper divisors (8504735).

42523645 is an equidigital number, since it uses as much as digits as its factorization.

42523645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8504734.

The product of its digits is 28800, while the sum is 31.

The square root of 42523645 is about 6521.0156417540. The cubic root of 42523645 is about 349.0413084002.

The spelling of 42523645 in words is "forty-two million, five hundred twenty-three thousand, six hundred forty-five".