1994021802 has 48 divisors (see below), whose sum is σ = 4431758760. Its totient is φ = 647740800.

The previous prime is 1994021789. The next prime is 1994021807. The reversal of 1994021802 is 2081204991.

It can be written as a sum of positive squares in 4 ways, for example, as 1360945881 + 633075921 = 36891^2 + 25161^2 .

It is a super-2 number, since 2×1994021802² = 7952245893702654408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1994021807) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 111352 + ... + 128012.

Almost surely, 2^1994021802 is an apocalyptic number.

1994021802 is an abundant number, since it is smaller than the sum of its proper divisors (2437736958).

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

1994021802 is a wasteful number, since it uses less digits than its factorization.

1994021802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16839 (or 16836 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1994021802 is about 44654.4712430905. The cubic root of 1994021802 is about 1258.6644541155.

The spelling of 1994021802 in words is "one billion, nine hundred ninety-four million, twenty-one thousand, eight hundred two".