42951645 has 24 divisors (see below), whose sum is σ = 81218592. Its totient is φ = 20824800.

The previous prime is 42951617. The next prime is 42951653. The reversal of 42951645 is 54615924.

42951645 is a `hidden beast` number, since 4 + 2 + 9 + 5 + 1 + 645 = 666.

It is not a de Polignac number, because 42951645 - 2¹⁷ = 42820573 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42891 + ... + 43880.

It is an arithmetic number, because the mean of its divisors is an integer number (3384108).

Almost surely, 2^42951645 is an apocalyptic number.

42951645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42951645 is a deficient number, since it is larger than the sum of its proper divisors (38266947).

42951645 is a wasteful number, since it uses less digits than its factorization.

42951645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86793 (or 86790 counting only the distinct ones).

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

The square root of 42951645 is about 6553.7504529849. The cubic root of 42951645 is about 350.2084336711.

The spelling of 42951645 in words is "forty-two million, nine hundred fifty-one thousand, six hundred forty-five".