42930981 has 6 divisors (see below), whose sum is σ = 62011430. Its totient is φ = 28620648.

The previous prime is 42930971. The next prime is 42931027. The reversal of 42930981 is 18903924.

It can be written as a sum of positive squares in only one way, i.e., 31741956 + 11189025 = 5634^2 + 3345^2 .

It is not a de Polignac number, because 42930981 - 2⁶ = 42930917 is a prime.

It is a super-2 number, since 2×42930981² = 3686138259244722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42930941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2385046 + ... + 2385063.

Almost surely, 2^42930981 is an apocalyptic number.

It is an amenable number.

42930981 is a deficient number, since it is larger than the sum of its proper divisors (19080449).

42930981 is a wasteful number, since it uses less digits than its factorization.

42930981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770115 (or 4770112 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 42930981 is about 6552.1737614322. The cubic root of 42930981 is about 350.1522630020.

The spelling of 42930981 in words is "forty-two million, nine hundred thirty thousand, nine hundred eighty-one".