42154839 has 6 divisors (see below), whose sum is σ = 60890336. Its totient is φ = 28103220.

The previous prime is 42154813. The next prime is 42154841. The reversal of 42154839 is 93845124.

It is not a de Polignac number, because 42154839 - 2⁵ = 42154807 is a prime.

It is a super-2 number, since 2×42154839² = 3554060902231842, 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 (42154439) 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, 2341927 + ... + 2341944.

Almost surely, 2^42154839 is an apocalyptic number.

42154839 is a deficient number, since it is larger than the sum of its proper divisors (18735497).

42154839 is a wasteful number, since it uses less digits than its factorization.

42154839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683877 (or 4683874 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 42154839 is about 6492.6757966188. The cubic root of 42154839 is about 348.0293029229.

The spelling of 42154839 in words is "forty-two million, one hundred fifty-four thousand, eight hundred thirty-nine".