42156534 has 64 divisors (see below), whose sum is σ = 99643392. Its totient is φ = 11642400.

The previous prime is 42156523. The next prime is 42156553. The reversal of 42156534 is 43565124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199689 + ... + 199899.

It is an arithmetic number, because the mean of its divisors is an integer number (1556928).

Almost surely, 2^42156534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42156534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49821696).

42156534 is an abundant number, since it is smaller than the sum of its proper divisors (57486858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42156534 is a wasteful number, since it uses less digits than its factorization.

42156534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361.

The product of its digits is 14400, while the sum is 30.

The square root of 42156534 is about 6492.8063270053. The cubic root of 42156534 is about 348.0339674864.

The spelling of 42156534 in words is "forty-two million, one hundred fifty-six thousand, five hundred thirty-four".