181953816 has 32 divisors (see below), whose sum is σ = 496238400. Its totient is φ = 55137440.

The previous prime is 181953799. The next prime is 181953841. The reversal of 181953816 is 618359181.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344346 + ... + 344873.

It is an arithmetic number, because the mean of its divisors is an integer number (15507450).

Almost surely, 2^181953816 is an apocalyptic number.

It is an amenable number.

181953816 is an abundant number, since it is smaller than the sum of its proper divisors (314284584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181953816 is a wasteful number, since it uses less digits than its factorization.

181953816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689239 (or 689235 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 181953816 is about 13489.0257617072. The cubic root of 181953816 is about 566.6571713903.

The spelling of 181953816 in words is "one hundred eighty-one million, nine hundred fifty-three thousand, eight hundred sixteen".