1990436292 has 72 divisors (see below), whose sum is σ = 5424748056. Its totient is φ = 611725824.

The previous prime is 1990436281. The next prime is 1990436299. The reversal of 1990436292 is 2926340991.

It is a happy number.

1990436292 is a `hidden beast` number, since 19 + 9 + 0 + 4 + 3 + 629 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3594816 + 1986841476 = 1896^2 + 44574^2 .

It is not an unprimeable number, because it can be changed into a prime (1990436299) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 511458 + ... + 515334.

It is an arithmetic number, because the mean of its divisors is an integer number (75343723).

Almost surely, 2^1990436292 is an apocalyptic number.

1990436292 is a gapful number since it is divisible by the number (12) 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 1990436292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2712374028).

1990436292 is an abundant number, since it is smaller than the sum of its proper divisors (3434311764).

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

1990436292 is a wasteful number, since it uses less digits than its factorization.

1990436292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997 (or 4992 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 1990436292 is about 44614.3059118933. The cubic root of 1990436292 is about 1257.9095874691.

The spelling of 1990436292 in words is "one billion, nine hundred ninety million, four hundred thirty-six thousand, two hundred ninety-two".