81412938 has 20 divisors (see below), whose sum is σ = 182425650. Its totient is φ = 27137592.

The previous prime is 81412937. The next prime is 81412993. The reversal of 81412938 is 83921418.

It can be written as a sum of positive squares in only one way, i.e., 78269409 + 3143529 = 8847^2 + 1773^2 .

It is not an unprimeable number, because it can be changed into a prime (81412937) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 251113 + ... + 251436.

Almost surely, 2^81412938 is an apocalyptic number.

81412938 is an abundant number, since it is smaller than the sum of its proper divisors (101012712).

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

81412938 is a wasteful number, since it uses less digits than its factorization.

81412938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502563 (or 502554 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 81412938 is about 9022.9118359873. The cubic root of 81412938 is about 433.4088840001.

The spelling of 81412938 in words is "eighty-one million, four hundred twelve thousand, nine hundred thirty-eight".