1998936940 has 288 divisors, whose sum is σ = 5893453440. Its totient is φ = 553512960.

The previous prime is 1998936917. The next prime is 1998936941. The reversal of 1998936940 is 496398991.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (1998936941) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6386224 + ... + 6386536.

It is an arithmetic number, because the mean of its divisors is an integer number (20463380).

Almost surely, 2^1998936940 is an apocalyptic number.

1998936940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998936940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2946726720).

1998936940 is an abundant number, since it is smaller than the sum of its proper divisors (3894516500).

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

1998936940 is a wasteful number, since it uses less digits than its factorization.

1998936940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 1998936940 is about 44709.4725980972. The cubic root of 1998936940 is about 1259.6977817204.

The spelling of 1998936940 in words is "one billion, nine hundred ninety-eight million, nine hundred thirty-six thousand, nine hundred forty".