19098990 has 160 divisors (see below), whose sum is σ = 58021920. Its totient is φ = 4478976.

The previous prime is 19098983. The next prime is 19098991. The reversal of 19098990 is 9989091.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19098991) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 261594 + ... + 261666.

It is an arithmetic number, because the mean of its divisors is an integer number (362637).

Almost surely, 2^19098990 is an apocalyptic number.

19098990 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 19098990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29010960).

19098990 is an abundant number, since it is smaller than the sum of its proper divisors (38922930).

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

19098990 is a wasteful number, since it uses less digits than its factorization.

19098990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 19098990 is about 4370.2391238924. The cubic root of 19098990 is about 267.3027748203.

The spelling of 19098990 in words is "nineteen million, ninety-eight thousand, nine hundred ninety".