42185451 has 64 divisors (see below), whose sum is σ = 74612736. Its totient is φ = 20563200.

The previous prime is 42185419. The next prime is 42185471. The reversal of 42185451 is 15458124.

It is not a de Polignac number, because 42185451 - 2⁵ = 42185419 is a prime.

It is a super-2 number, since 2×42185451² = 3559224552146802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42185471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 307855 + ... + 307991.

It is an arithmetic number, because the mean of its divisors is an integer number (1165824).

Almost surely, 2^42185451 is an apocalyptic number.

42185451 is a deficient number, since it is larger than the sum of its proper divisors (32427285).

42185451 is a wasteful number, since it uses less digits than its factorization.

42185451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its digits is 6400, while the sum is 30.

The square root of 42185451 is about 6495.0327943745. The cubic root of 42185451 is about 348.1135265094.

It can be divided in two parts, 4218 and 5451, that added together give a palindrome (9669).

The spelling of 42185451 in words is "forty-two million, one hundred eighty-five thousand, four hundred fifty-one".