81421374 has 8 divisors (see below), whose sum is σ = 162842760. Its totient is φ = 27140456.

The previous prime is 81421369. The next prime is 81421387. The reversal of 81421374 is 47312418.

It is a sphenic number, since it is the product of 3 distinct primes.

81421374 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6785109 + ... + 6785120.

It is an arithmetic number, because the mean of its divisors is an integer number (20355345).

Almost surely, 2^81421374 is an apocalyptic number.

81421374 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81421374 is a wasteful number, since it uses less digits than its factorization.

81421374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13570234.

The product of its digits is 5376, while the sum is 30.

The square root of 81421374 is about 9023.3793004617. The cubic root of 81421374 is about 433.4238534106.

The spelling of 81421374 in words is "eighty-one million, four hundred twenty-one thousand, three hundred seventy-four".