42920645 has 16 divisors (see below), whose sum is σ = 55060992. Its totient is φ = 32039040.

The previous prime is 42920641. The next prime is 42920651. The reversal of 42920645 is 54602924.

It is not a de Polignac number, because 42920645 - 2² = 42920641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42920641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164 + ... + 9266.

It is an arithmetic number, because the mean of its divisors is an integer number (3441312).

Almost surely, 2^42920645 is an apocalyptic number.

It is an amenable number.

42920645 is a deficient number, since it is larger than the sum of its proper divisors (12140347).

42920645 is a wasteful number, since it uses less digits than its factorization.

42920645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9172.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 42920645 is about 6551.3849680812. The cubic root of 42920645 is about 350.1241600315.

The spelling of 42920645 in words is "forty-two million, nine hundred twenty thousand, six hundred forty-five".