181920142 has 16 divisors (see below), whose sum is σ = 278974080. Its totient is φ = 88948728.

The previous prime is 181920113. The next prime is 181920149. The reversal of 181920142 is 241029181.

It is a super-3 number, since 3×181920142³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 181920142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181920149) 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, 13743 + ... + 23509.

It is an arithmetic number, because the mean of its divisors is an integer number (17435880).

Almost surely, 2^181920142 is an apocalyptic number.

181920142 is a deficient number, since it is larger than the sum of its proper divisors (97053938).

181920142 is a wasteful number, since it uses less digits than its factorization.

181920142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9975.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 181920142 is about 13487.7775040961. Note that the first 3 decimals coincide. The cubic root of 181920142 is about 566.6222123528.

The spelling of 181920142 in words is "one hundred eighty-one million, nine hundred twenty thousand, one hundred forty-two".