290426639 has 4 divisors (see below), whose sum is σ = 290910480. Its totient is φ = 289942800.

The previous prime is 290426629. The next prime is 290426651. The reversal of 290426639 is 936624092.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-290426639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 290426596 and 290426605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290426629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241019 + ... + 242220.

It is an arithmetic number, because the mean of its divisors is an integer number (72727620).

Almost surely, 2^290426639 is an apocalyptic number.

290426639 is a deficient number, since it is larger than the sum of its proper divisors (483841).

290426639 is an equidigital number, since it uses as much as digits as its factorization.

290426639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483840.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 290426639 is about 17041.9083145052. The cubic root of 290426639 is about 662.2350298633.

The spelling of 290426639 in words is "two hundred ninety million, four hundred twenty-six thousand, six hundred thirty-nine".