42991430 has 16 divisors (see below), whose sum is σ = 77474880. Its totient is φ = 17176512.

The previous prime is 42991391. The next prime is 42991441. The reversal of 42991430 is 3419924.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9011 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (4842180).

Almost surely, 2^42991430 is an apocalyptic number.

42991430 is a deficient number, since it is larger than the sum of its proper divisors (34483450).

42991430 is a wasteful number, since it uses less digits than its factorization.

42991430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5023.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 42991430 is about 6556.7850353660. The cubic root of 42991430 is about 350.3165299796.

The spelling of 42991430 in words is "forty-two million, nine hundred ninety-one thousand, four hundred thirty".