81242338 has 8 divisors (see below), whose sum is σ = 121902300. Its totient is φ = 40608240.

The previous prime is 81242321. The next prime is 81242339. The reversal of 81242338 is 83324218.

It can be written as a sum of positive squares in 2 ways, for example, as 80514729 + 727609 = 8973^2 + 853^2 .

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 (81242339) 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, 6988 + ... + 14536.

Almost surely, 2^81242338 is an apocalyptic number.

81242338 is a deficient number, since it is larger than the sum of its proper divisors (40659962).

81242338 is a wasteful number, since it uses less digits than its factorization.

81242338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12932.

The product of its digits is 9216, while the sum is 31.

The square root of 81242338 is about 9013.4531673493. The cubic root of 81242338 is about 433.1059376291.

The spelling of 81242338 in words is "eighty-one million, two hundred forty-two thousand, three hundred thirty-eight".