990345145 has 16 divisors (see below), whose sum is σ = 1221774480. Its totient is φ = 770079744.

The previous prime is 990345107. The next prime is 990345163. The reversal of 990345145 is 541543099.

It can be written as a sum of positive squares in 8 ways, for example, as 173056 + 990172089 = 416^2 + 31467^2 .

It is a cyclic number.

It is not a de Polignac number, because 990345145 - 2¹⁷ = 990214073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 990345098 and 990345107.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 236389 + ... + 240541.

It is an arithmetic number, because the mean of its divisors is an integer number (76360905).

Almost surely, 2^990345145 is an apocalyptic number.

It is an amenable number.

990345145 is a deficient number, since it is larger than the sum of its proper divisors (231429335).

990345145 is a wasteful number, since it uses less digits than its factorization.

990345145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5484.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 990345145 is about 31469.7496812415. The cubic root of 990345145 is about 996.7713017266.

The spelling of 990345145 in words is "nine hundred ninety million, three hundred forty-five thousand, one hundred forty-five".