81469394 has 8 divisors (see below), whose sum is σ = 122495628. Its totient is φ = 40637520.

The previous prime is 81469393. The next prime is 81469411. The reversal of 81469394 is 49396418.

It can be written as a sum of positive squares in 2 ways, for example, as 81450625 + 18769 = 9025^2 + 137^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81469393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47537 + ... + 49220.

Almost surely, 2^81469394 is an apocalyptic number.

81469394 is a deficient number, since it is larger than the sum of its proper divisors (41026234).

81469394 is a wasteful number, since it uses less digits than its factorization.

81469394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97180.

The product of its digits is 186624, while the sum is 44.

The square root of 81469394 is about 9026.0397738986. The cubic root of 81469394 is about 433.5090436668.

The spelling of 81469394 in words is "eighty-one million, four hundred sixty-nine thousand, three hundred ninety-four".