290431 has 4 divisors (see below), whose sum is σ = 291600. Its totient is φ = 289264.

The previous prime is 290429. The next prime is 290441. The reversal of 290431 is 134092.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 290431 - 2¹ = 290429 is a prime.

It is a super-2 number, since 2×290431² = 168700331522, which contains 22 as substring.

It is a Duffinian number.

290431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 290399 and 290408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (72900).

2²⁹⁰⁴³¹ is an apocalyptic number.

290431 is a deficient number, since it is larger than the sum of its proper divisors (1169).

290431 is an equidigital number, since it uses as much as digits as its factorization.

290431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 290431 is about 538.9165055925. The cubic root of 290431 is about 66.2238344519.

The spelling of 290431 in words is "two hundred ninety thousand, four hundred thirty-one".