181420992 has 112 divisors (see below), whose sum is σ = 541649920. Its totient is φ = 59533056.

The previous prime is 181420979. The next prime is 181421011. The reversal of 181420992 is 299024181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 114993 + ... + 116559.

It is an arithmetic number, because the mean of its divisors is an integer number (4836160).

Almost surely, 2^181420992 is an apocalyptic number.

181420992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181420992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270824960).

181420992 is an abundant number, since it is smaller than the sum of its proper divisors (360228928).

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

181420992 is a wasteful number, since it uses less digits than its factorization.

181420992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 181420992 is about 13469.2610042274. The cubic root of 181420992 is about 566.1035075633.

The spelling of 181420992 in words is "one hundred eighty-one million, four hundred twenty thousand, nine hundred ninety-two".