81400346 has 8 divisors (see below), whose sum is σ = 122979360. Its totient is φ = 40407228.

The previous prime is 81400343. The next prime is 81400349. The reversal of 81400346 is 64300418.

It is an interprime number because it is at equal distance from previous prime (81400343) and next prime (81400349).

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 (81400343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146126 + ... + 146681.

It is an arithmetic number, because the mean of its divisors is an integer number (15372420).

Almost surely, 2^81400346 is an apocalyptic number.

81400346 is a deficient number, since it is larger than the sum of its proper divisors (41579014).

81400346 is a wasteful number, since it uses less digits than its factorization.

81400346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292948.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81400346 is about 9022.2140298266. The cubic root of 81400346 is about 433.3865379775.

The spelling of 81400346 in words is "eighty-one million, four hundred thousand, three hundred forty-six".