1990290446 has 32 divisors (see below), whose sum is σ = 3073464000. Its totient is φ = 966380800.

The previous prime is 1990290403. The next prime is 1990290499. The reversal of 1990290446 is 6440920991.

It is a super-2 number, since 2×1990290446² = 7922512118877757832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1990290397 and 1990290406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2678351 + ... + 2679093.

It is an arithmetic number, because the mean of its divisors is an integer number (96045750).

Almost surely, 2^1990290446 is an apocalyptic number.

1990290446 is a deficient number, since it is larger than the sum of its proper divisors (1083173554).

1990290446 is a wasteful number, since it uses less digits than its factorization.

1990290446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1990290446 is about 44612.6713613969. The cubic root of 1990290446 is about 1257.8788629552.

The spelling of 1990290446 in words is "one billion, nine hundred ninety million, two hundred ninety thousand, four hundred forty-six".