42904161 has 10 divisors (see below), whose sum is σ = 64091522. Its totient is φ = 28602720.

The previous prime is 42904159. The next prime is 42904181. The reversal of 42904161 is 16140924.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 3779136 = 6255^2 + 1944^2 .

It is not a de Polignac number, because 42904161 - 2¹ = 42904159 is a prime.

It is a super-2 number, since 2×42904161² = 3681534062227842, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42904181) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 264760 + ... + 264921.

Almost surely, 2^42904161 is an apocalyptic number.

It is an amenable number.

42904161 is a deficient number, since it is larger than the sum of its proper divisors (21187361).

42904161 is an equidigital number, since it uses as much as digits as its factorization.

42904161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529693 (or 529684 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 42904161 is about 6550.1267926659. The cubic root of 42904161 is about 350.0793316770.

The spelling of 42904161 in words is "forty-two million, nine hundred four thousand, one hundred sixty-one".