990401655 has 8 divisors (see below), whose sum is σ = 1584642672. Its totient is φ = 528214208.

The previous prime is 990401647. The next prime is 990401669. The reversal of 990401655 is 556104099.

990401655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990401655 - 2³ = 990401647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33013374 + ... + 33013403.

It is an arithmetic number, because the mean of its divisors is an integer number (198080334).

Almost surely, 2^990401655 is an apocalyptic number.

990401655 is a deficient number, since it is larger than the sum of its proper divisors (594241017).

990401655 is a wasteful number, since it uses less digits than its factorization.

990401655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66026785.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 990401655 is about 31470.6475147875. The cubic root of 990401655 is about 996.7902602602.

The spelling of 990401655 in words is "nine hundred ninety million, four hundred one thousand, six hundred fifty-five".