81974374 has 8 divisors (see below), whose sum is σ = 130194648. Its totient is φ = 38576160.

The previous prime is 81974363. The next prime is 81974437. The reversal of 81974374 is 47347918.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81974374.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205472 + ... + 1205539.

It is an arithmetic number, because the mean of its divisors is an integer number (16274331).

Almost surely, 2^81974374 is an apocalyptic number.

81974374 is a deficient number, since it is larger than the sum of its proper divisors (48220274).

81974374 is a wasteful number, since it uses less digits than its factorization.

81974374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411030.

The product of its digits is 169344, while the sum is 43.

The square root of 81974374 is about 9053.9700684285. The cubic root of 81974374 is about 434.4028870801.

The spelling of 81974374 in words is "eighty-one million, nine hundred seventy-four thousand, three hundred seventy-four".