1990436001840 has 320 divisors, whose sum is σ = 8054539476480. Its totient is φ = 445412183040.

The previous prime is 1990436001821. The next prime is 1990436001857. The reversal of 1990436001840 is 481006340991.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2913142 + ... + 3530901.

It is an arithmetic number, because the mean of its divisors is an integer number (25170435864).

Almost surely, 2^{1990436001840} is an apocalyptic number.

1990436001840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990436001840 is an abundant number, since it is smaller than the sum of its proper divisors (6064103474640).

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

1990436001840 is a wasteful number, since it uses less digits than its factorization.

1990436001840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444089 (or 6444077 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 1990436001840 in words is "one trillion, nine hundred ninety billion, four hundred thirty-six million, one thousand, eight hundred forty".