102181839 has 8 divisors (see below), whose sum is σ = 137967360. Its totient is φ = 67258776.

The previous prime is 102181817. The next prime is 102181843. The reversal of 102181839 is 938181201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 102181839 - 2¹² = 102177743 is a prime.

It is a super-2 number, since 2×102181839² = 20882256442843842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102181139) 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, 215337 + ... + 215810.

It is an arithmetic number, because the mean of its divisors is an integer number (17245920).

Almost surely, 2^102181839 is an apocalyptic number.

102181839 is a deficient number, since it is larger than the sum of its proper divisors (35785521).

102181839 is an equidigital number, since it uses as much as digits as its factorization.

102181839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431229.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 102181839 is about 10108.5033016763. The cubic root of 102181839 is about 467.5103588504.

The spelling of 102181839 in words is "one hundred two million, one hundred eighty-one thousand, eight hundred thirty-nine".