42942391 has 4 divisors (see below), whose sum is σ = 45468432. Its totient is φ = 40416352.

The previous prime is 42942379. The next prime is 42942401. The reversal of 42942391 is 19324924.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42942391 - 2¹¹ = 42940343 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 (42942091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1262995 + ... + 1263028.

It is an arithmetic number, because the mean of its divisors is an integer number (11367108).

Almost surely, 2^42942391 is an apocalyptic number.

42942391 is a deficient number, since it is larger than the sum of its proper divisors (2526041).

42942391 is a wasteful number, since it uses less digits than its factorization.

42942391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526040.

The product of its digits is 15552, while the sum is 34.

The square root of 42942391 is about 6553.0444069913. The cubic root of 42942391 is about 350.1832808772.

The spelling of 42942391 in words is "forty-two million, nine hundred forty-two thousand, three hundred ninety-one".