1990881240 has 32 divisors (see below), whose sum is σ = 5972644080. Its totient is φ = 530901632.

The previous prime is 1990881229. The next prime is 1990881281. The reversal of 1990881240 is 421880991.

It is a super-2 number, since 2×1990881240² = 7927216223567875200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1990881192 and 1990881201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8295219 + ... + 8295458.

Almost surely, 2^1990881240 is an apocalyptic number.

1990881240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990881240 is an abundant number, since it is smaller than the sum of its proper divisors (3981762840).

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

1990881240 is a wasteful number, since it uses less digits than its factorization.

1990881240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16590691 (or 16590687 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1990881240 is about 44619.2922400165. The cubic root of 1990881240 is about 1258.0033127588.

The spelling of 1990881240 in words is "one billion, nine hundred ninety million, eight hundred eighty-one thousand, two hundred forty".