990815254 has 16 divisors (see below), whose sum is σ = 1746052560. Its totient is φ = 415726560.

The previous prime is 990815251. The next prime is 990815279. The reversal of 990815254 is 452518099.

It is a self number, because there is not a number n which added to its sum of digits gives 990815254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990815251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731909 + ... + 1732480.

It is an arithmetic number, because the mean of its divisors is an integer number (109128285).

Almost surely, 2^990815254 is an apocalyptic number.

990815254 is a deficient number, since it is larger than the sum of its proper divisors (755237306).

990815254 is a wasteful number, since it uses less digits than its factorization.

990815254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3464415.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 990815254 is about 31477.2180155744. The cubic root of 990815254 is about 996.9289965923.

The spelling of 990815254 in words is "nine hundred ninety million, eight hundred fifteen thousand, two hundred fifty-four".