1990215940 has 48 divisors (see below), whose sum is σ = 4383816192. Its totient is φ = 758077056.

The previous prime is 1990215937. The next prime is 1990215979. The reversal of 1990215940 is 495120991.

It is a junction number, because it is equal to n+sod(n) for n = 1990215893 and 1990215902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6169 + ... + 63391.

It is an arithmetic number, because the mean of its divisors is an integer number (91329504).

Almost surely, 2^1990215940 is an apocalyptic number.

1990215940 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 1990215940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2191908096).

1990215940 is an abundant number, since it is smaller than the sum of its proper divisors (2393600252).

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

1990215940 is a wasteful number, since it uses less digits than its factorization.

1990215940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57316 (or 57314 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 1990215940 is about 44611.8363217656. The cubic root of 1990215940 is about 1257.8631666377.

The spelling of 1990215940 in words is "one billion, nine hundred ninety million, two hundred fifteen thousand, nine hundred forty".