1984914990 has 128 divisors (see below), whose sum is σ = 5663923200. Its totient is φ = 493153920.

The previous prime is 1984914989. The next prime is 1984914991. The reversal of 1984914990 is 994194891.

It is an interprime number because it is at equal distance from previous prime (1984914989) and next prime (1984914991).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1984914991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 309759 + ... + 316101.

It is an arithmetic number, because the mean of its divisors is an integer number (44249400).

Almost surely, 2^1984914990 is an apocalyptic number.

1984914990 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 1984914990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2831961600).

1984914990 is an abundant number, since it is smaller than the sum of its proper divisors (3679008210).

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

1984914990 is a wasteful number, since it uses less digits than its factorization.

1984914990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6439 (or 6433 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 1984914990 is about 44552.3847846555. The cubic root of 1984914990 is about 1256.7453987341.

The spelling of 1984914990 in words is "one billion, nine hundred eighty-four million, nine hundred fourteen thousand, nine hundred ninety".