81393430 has 32 divisors (see below), whose sum is σ = 152137440. Its totient is φ = 31315200.

The previous prime is 81393427. The next prime is 81393457. The reversal of 81393430 is 3439318.

It is a junction number, because it is equal to n+sod(n) for n = 81393392 and 81393401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135130 + ... + 135730.

It is an arithmetic number, because the mean of its divisors is an integer number (4754295).

Almost surely, 2^81393430 is an apocalyptic number.

81393430 is a deficient number, since it is larger than the sum of its proper divisors (70744010).

81393430 is a wasteful number, since it uses less digits than its factorization.

81393430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 81393430 is about 9021.8307454751. The cubic root of 81393430 is about 433.3742637209.

The spelling of 81393430 in words is "eighty-one million, three hundred ninety-three thousand, four hundred thirty".