102399990 has 128 divisors (see below), whose sum is σ = 310238208. Its totient is φ = 21012480.

The previous prime is 102399989. The next prime is 102400007. The reversal of 102399990 is 99993201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 223842 + ... + 224298.

It is an arithmetic number, because the mean of its divisors is an integer number (2423736).

Almost surely, 2^102399990 is an apocalyptic number.

102399990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 102399990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155119104).

102399990 is an abundant number, since it is smaller than the sum of its proper divisors (207838218).

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

102399990 is a wasteful number, since it uses less digits than its factorization.

102399990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 102399990 is about 10119.2880184329. The cubic root of 102399990 is about 467.8428228848.

The spelling of 102399990 in words is "one hundred two million, three hundred ninety-nine thousand, nine hundred ninety".