42451812 has 36 divisors (see below), whose sum is σ = 115564540. Its totient is φ = 13061952.

The previous prime is 42451807. The next prime is 42451817. The reversal of 42451812 is 21815424.

It is an interprime number because it is at equal distance from previous prime (42451807) and next prime (42451817).

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 19927296 = 4746^2 + 4464^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (42451817) 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, 44887 + ... + 45822.

Almost surely, 2^42451812 is an apocalyptic number.

It is an amenable number.

42451812 is an abundant number, since it is smaller than the sum of its proper divisors (73112728).

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

42451812 is a wasteful number, since it uses less digits than its factorization.

42451812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90732 (or 90727 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 42451812 is about 6515.5055060985. The cubic root of 42451812 is about 348.8446584691.

The spelling of 42451812 in words is "forty-two million, four hundred fifty-one thousand, eight hundred twelve".