181739940 has 48 divisors (see below), whose sum is σ = 535657920. Its totient is φ = 45912960.

The previous prime is 181739939. The next prime is 181739963. The reversal of 181739940 is 49937181.

It is a happy number.

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 junction number, because it is equal to n+sod(n) for n = 181739892 and 181739901.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78571 + ... + 80850.

It is an arithmetic number, because the mean of its divisors is an integer number (11159540).

Almost surely, 2^181739940 is an apocalyptic number.

181739940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181739940 is an abundant number, since it is smaller than the sum of its proper divisors (353917980).

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

181739940 is a wasteful number, since it uses less digits than its factorization.

181739940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159452 (or 159450 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 181739940 is about 13481.0956528021. The cubic root of 181739940 is about 566.4350602918.

The spelling of 181739940 in words is "one hundred eighty-one million, seven hundred thirty-nine thousand, nine hundred forty".