102489840 has 160 divisors (see below), whose sum is σ = 368547840. Its totient is φ = 26129664.

The previous prime is 102489839. The next prime is 102489853. The reversal of 102489840 is 48984201.

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

It is a junction number, because it is equal to n+sod(n) for n = 102489795 and 102489804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48649 + ... + 50711.

It is an arithmetic number, because the mean of its divisors is an integer number (2303424).

Almost surely, 2^102489840 is an apocalyptic number.

102489840 is a gapful number since it is divisible by the number (10) 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 102489840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184273920).

102489840 is an abundant number, since it is smaller than the sum of its proper divisors (266058000).

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

102489840 is a wasteful number, since it uses less digits than its factorization.

102489840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108 (or 2096 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 102489840 is about 10123.7265865886. The cubic root of 102489840 is about 467.9796177843.

The spelling of 102489840 in words is "one hundred two million, four hundred eighty-nine thousand, eight hundred forty".