1084821990 has 64 divisors (see below), whose sum is σ = 2980523520. Its totient is φ = 247541760.

The previous prime is 1084821923. The next prime is 1084822001. The reversal of 1084821990 is 991284801.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130581 + ... + 138639.

It is an arithmetic number, because the mean of its divisors is an integer number (46570680).

Almost surely, 2^1084821990 is an apocalyptic number.

1084821990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1084821990 is an abundant number, since it is smaller than the sum of its proper divisors (1895701530).

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

1084821990 is a wasteful number, since it uses less digits than its factorization.

1084821990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8717.

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

The square root of 1084821990 is about 32936.6359848725. The cubic root of 1084821990 is about 1027.5102431477.

The spelling of 1084821990 in words is "one billion, eighty-four million, eight hundred twenty-one thousand, nine hundred ninety".