2990305 has 8 divisors (see below), whose sum is σ = 3610152. Its totient is φ = 2377728.

The previous prime is 2990279. The next prime is 2990333. The reversal of 2990305 is 5030992.

It can be written as a sum of positive squares in 4 ways, for example, as 154449 + 2835856 = 393^2 + 1684^2 .

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 2990305 - 2¹¹ = 2988257 is a prime.

It is a Duffinian number.

2990305 is a lucky number.

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, 864 + ... + 2593.

It is an arithmetic number, because the mean of its divisors is an integer number (451269).

2^2990305 is an apocalyptic number.

2990305 is the 865-th decagonal number.

It is an amenable number.

2990305 is a deficient number, since it is larger than the sum of its proper divisors (619847).

2990305 is a wasteful number, since it uses less digits than its factorization.

2990305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 2990305 is about 1729.2498373572. The cubic root of 2990305 is about 144.0694270412.

The spelling of 2990305 in words is "two million, nine hundred ninety thousand, three hundred five".