181961376 has 48 divisors (see below), whose sum is σ = 480362400. Its totient is φ = 60309248.

The previous prime is 181961371. The next prime is 181961383. The reversal of 181961376 is 673169181.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (181961371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11890 + ... + 22478.

It is an arithmetic number, because the mean of its divisors is an integer number (10007550).

Almost surely, 2^181961376 is an apocalyptic number.

181961376 is a gapful number since it is divisible by the number (16) 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 181961376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240181200).

181961376 is an abundant number, since it is smaller than the sum of its proper divisors (298401024).

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

181961376 is a wasteful number, since it uses less digits than its factorization.

181961376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10781 (or 10773 counting only the distinct ones).

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

The square root of 181961376 is about 13489.3059865955. The cubic root of 181961376 is about 566.6650192955.

The spelling of 181961376 in words is "one hundred eighty-one million, nine hundred sixty-one thousand, three hundred seventy-six".