81403954 has 8 divisors (see below), whose sum is σ = 126044928. Its totient is φ = 39388980.

The previous prime is 81403943. The next prime is 81403963. The reversal of 81403954 is 45930418.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656422 + ... + 656545.

It is an arithmetic number, because the mean of its divisors is an integer number (15755616).

Almost surely, 2^81403954 is an apocalyptic number.

81403954 is a deficient number, since it is larger than the sum of its proper divisors (44640974).

81403954 is a wasteful number, since it uses less digits than its factorization.

81403954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313000.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81403954 is about 9022.4139785315. The cubic root of 81403954 is about 433.3929410441.

The spelling of 81403954 in words is "eighty-one million, four hundred three thousand, nine hundred fifty-four".