42945945 has 32 divisors (see below), whose sum is σ = 81948672. Its totient is φ = 18777792.

The previous prime is 42945941. The next prime is 42945977. The reversal of 42945945 is 54954924.

It is not a de Polignac number, because 42945945 - 2² = 42945941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42945897 and 42945906.

It is not an unprimeable number, because it can be changed into a prime (42945941) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6477 + ... + 11306.

It is an arithmetic number, because the mean of its divisors is an integer number (2560896).

Almost surely, 2^42945945 is an apocalyptic number.

It is an amenable number.

42945945 is a deficient number, since it is larger than the sum of its proper divisors (39002727).

42945945 is a wasteful number, since it uses less digits than its factorization.

42945945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17821.

The product of its digits is 259200, while the sum is 42.

The square root of 42945945 is about 6553.3155730516. The cubic root of 42945945 is about 350.1929412386.

The spelling of 42945945 in words is "forty-two million, nine hundred forty-five thousand, nine hundred forty-five".