290821138 has 8 divisors (see below), whose sum is σ = 442742832. Its totient is φ = 143240196.

The previous prime is 290821109. The next prime is 290821171. The reversal of 290821138 is 831128092.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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, 1085020 + ... + 1085287.

It is an arithmetic number, because the mean of its divisors is an integer number (55342854).

Almost surely, 2^290821138 is an apocalyptic number.

290821138 is a deficient number, since it is larger than the sum of its proper divisors (151921694).

290821138 is a wasteful number, since it uses less digits than its factorization.

290821138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170376.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 290821138 is about 17053.4787653429. The cubic root of 290821138 is about 662.5347416455.

The spelling of 290821138 in words is "two hundred ninety million, eight hundred twenty-one thousand, one hundred thirty-eight".