81126398 has 8 divisors (see below), whose sum is σ = 125885880. Its totient is φ = 39164440.

The previous prime is 81126391. The next prime is 81126403. The reversal of 81126398 is 89362118.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81126391) 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, 699308 + ... + 699423.

It is an arithmetic number, because the mean of its divisors is an integer number (15735735).

Almost surely, 2^81126398 is an apocalyptic number.

81126398 is a deficient number, since it is larger than the sum of its proper divisors (44759482).

81126398 is a wasteful number, since it uses less digits than its factorization.

81126398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398762.

The product of its digits is 20736, while the sum is 38.

The square root of 81126398 is about 9007.0193737995. The cubic root of 81126398 is about 432.8998127220.

The spelling of 81126398 in words is "eighty-one million, one hundred twenty-six thousand, three hundred ninety-eight".