1001994990 has 32 divisors (see below), whose sum is σ = 2419200000. Its totient is φ = 265597344.

The previous prime is 1001994971. The next prime is 1001994991. The reversal of 1001994990 is 994991001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001994991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94990 + ... + 105009.

It is an arithmetic number, because the mean of its divisors is an integer number (75600000).

Almost surely, 2^1001994990 is an apocalyptic number.

1001994990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001994990 is an abundant number, since it is smaller than the sum of its proper divisors (1417205010).

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

1001994990 is a wasteful number, since it uses less digits than its factorization.

1001994990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200176.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 1001994990 is about 31654.3044466310. The cubic root of 1001994990 is about 1000.6645549356.

The spelling of 1001994990 in words is "one billion, one million, nine hundred ninety-four thousand, nine hundred ninety".