24399990 has 72 divisors (see below), whose sum is σ = 67043808. Its totient is φ = 6156000.

The previous prime is 24399967. The next prime is 24400001. The reversal of 24399990 is 9999342.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32115 + ... + 32865.

It is an arithmetic number, because the mean of its divisors is an integer number (931164).

Almost surely, 2^24399990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 24399990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33521904).

24399990 is an abundant number, since it is smaller than the sum of its proper divisors (42643818).

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

24399990 is a wasteful number, since it uses less digits than its factorization.

24399990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 24399990 is about 4939.6346018709. The cubic root of 24399990 is about 290.0435527137.

The spelling of 24399990 in words is "twenty-four million, three hundred ninety-nine thousand, nine hundred ninety".