181854738 has 48 divisors (see below), whose sum is σ = 446671680. Its totient is φ = 53008992.

The previous prime is 181854709. The next prime is 181854749. The reversal of 181854738 is 837458181.

It is a happy number.

It is a super-2 number, since 2×181854738² = 66142291466097288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181854693 and 181854702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16006 + ... + 24897.

It is an arithmetic number, because the mean of its divisors is an integer number (9305660).

Almost surely, 2^181854738 is an apocalyptic number.

181854738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

181854738 is an abundant number, since it is smaller than the sum of its proper divisors (264816942).

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

181854738 is a wasteful number, since it uses less digits than its factorization.

181854738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40943 (or 40940 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 181854738 is about 13485.3527206373. The cubic root of 181854738 is about 566.5543001343.

It can be divided in two parts, 18 and 1854738, that multiplied together give a square (33385284 = 5778²).

The spelling of 181854738 in words is "one hundred eighty-one million, eight hundred fifty-four thousand, seven hundred thirty-eight".