42945825 has 48 divisors (see below), whose sum is σ = 80994816. Its totient is φ = 19891200.

The previous prime is 42945821. The next prime is 42945829. The reversal of 42945825 is 52854924.

It is an interprime number because it is at equal distance from previous prime (42945821) and next prime (42945829).

It is not a de Polignac number, because 42945825 - 2² = 42945821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (42945821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15280 + ... + 17870.

It is an arithmetic number, because the mean of its divisors is an integer number (1687392).

Almost surely, 2^42945825 is an apocalyptic number.

It is an amenable number.

42945825 is a deficient number, since it is larger than the sum of its proper divisors (38048991).

42945825 is a wasteful number, since it uses less digits than its factorization.

42945825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2629 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The square root of 42945825 is about 6553.3064173744. The cubic root of 42945825 is about 350.1926150674.

Subtracting 42945825 from its reverse (52854924), we obtain a palindrome (9909099).

The spelling of 42945825 in words is "forty-two million, nine hundred forty-five thousand, eight hundred twenty-five".