42120234 has 24 divisors (see below), whose sum is σ = 98281092. Its totient is φ = 12960000.

The previous prime is 42120233. The next prime is 42120251. The reversal of 42120234 is 43202124.

It can be written as a sum of positive squares in 2 ways, for example, as 41024025 + 1096209 = 6405^2 + 1047^2 .

It is a super-2 number, since 2×42120234² = 3548228224429512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42120233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89767 + ... + 90234.

Almost surely, 2^42120234 is an apocalyptic number.

42120234 is an abundant number, since it is smaller than the sum of its proper divisors (56160858).

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

42120234 is a wasteful number, since it uses less digits than its factorization.

42120234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180022 (or 180019 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 42120234 is about 6490.0103235665. The cubic root of 42120234 is about 347.9340441789.

Adding to 42120234 its reverse (43202124), we get a palindrome (85322358).

The spelling of 42120234 in words is "forty-two million, one hundred twenty thousand, two hundred thirty-four".