290003993 has 4 divisors (see below), whose sum is σ = 290835300. Its totient is φ = 289172688.

The previous prime is 290003957. The next prime is 290003999. The reversal of 290003993 is 399300092.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 208426969 + 81577024 = 14437^2 + 9032^2 .

It is a cyclic number.

It is not a de Polignac number, because 290003993 - 2⁸ = 290003737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290003999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415130 + ... + 415827.

It is an arithmetic number, because the mean of its divisors is an integer number (72708825).

Almost surely, 2^290003993 is an apocalyptic number.

It is an amenable number.

290003993 is a deficient number, since it is larger than the sum of its proper divisors (831307).

290003993 is an equidigital number, since it uses as much as digits as its factorization.

290003993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831306.

The product of its (nonzero) digits is 13122, while the sum is 35.

The square root of 290003993 is about 17029.5036040397. The cubic root of 290003993 is about 661.9136327301.

The spelling of 290003993 in words is "two hundred ninety million, three thousand, nine hundred ninety-three".