15489990 has 48 divisors (see below), whose sum is σ = 40669200. Its totient is φ = 4090176.

The previous prime is 15489979. The next prime is 15490001. The reversal of 15489990 is 9998451.

It is an interprime number because it is at equal distance from previous prime (15489979) and next prime (15490001).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9021 + ... + 10599.

It is an arithmetic number, because the mean of its divisors is an integer number (847275).

Almost surely, 2^15489990 is an apocalyptic number.

15489990 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 15489990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20334600).

15489990 is an abundant number, since it is smaller than the sum of its proper divisors (25179210).

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

15489990 is a wasteful number, since it uses less digits than its factorization.

15489990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1698 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 15489990 is about 3935.7324604195. The cubic root of 15489990 is about 249.2778627462.

The spelling of 15489990 in words is "fifteen million, four hundred eighty-nine thousand, nine hundred ninety".