42591645 has 24 divisors (see below), whose sum is σ = 74090016. Its totient is φ = 22634208.

The previous prime is 42591643. The next prime is 42591649. The reversal of 42591645 is 54619524.

42591645 is a `hidden beast` number, since 4 + 2 + 5 + 9 + 1 + 645 = 666.

It is not a de Polignac number, because 42591645 - 2¹ = 42591643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42591643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12274 + ... + 15356.

It is an arithmetic number, because the mean of its divisors is an integer number (3087084).

Almost surely, 2^42591645 is an apocalyptic number.

42591645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42591645 is a deficient number, since it is larger than the sum of its proper divisors (31498371).

42591645 is a wasteful number, since it uses less digits than its factorization.

42591645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401 (or 3398 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 42591645 is about 6526.2274707521. The cubic root of 42591645 is about 349.2272611697.

The spelling of 42591645 in words is "forty-two million, five hundred ninety-one thousand, six hundred forty-five".