81012394 has 8 divisors (see below), whose sum is σ = 126802080. Its totient is φ = 38745036.

The previous prime is 81012377. The next prime is 81012413. The reversal of 81012394 is 49321018.

It is a happy number.

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

It is a super-2 number, since 2×81012394² = 13126015963222472, which contains 22 as substring.

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, 880524 + ... + 880615.

It is an arithmetic number, because the mean of its divisors is an integer number (15850260).

Almost surely, 2^81012394 is an apocalyptic number.

81012394 is a deficient number, since it is larger than the sum of its proper divisors (45789686).

81012394 is a wasteful number, since it uses less digits than its factorization.

81012394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761164.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 81012394 is about 9000.6885292182. The cubic root of 81012394 is about 432.6969381657.

It can be divided in two parts, 81012 and 394, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 81012394 in words is "eighty-one million, twelve thousand, three hundred ninety-four".