290401921 has 4 divisors (see below), whose sum is σ = 291211200. Its totient is φ = 289592644.

The previous prime is 290401913. The next prime is 290401949. The reversal of 290401921 is 129104092.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 290401921 - 2³ = 290401913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 290401921.

It is not an unprimeable number, because it can be changed into a prime (290401901) 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, 404101 + ... + 404818.

It is an arithmetic number, because the mean of its divisors is an integer number (72802800).

Almost surely, 2^290401921 is an apocalyptic number.

It is an amenable number.

290401921 is a deficient number, since it is larger than the sum of its proper divisors (809279).

290401921 is an equidigital number, since it uses as much as digits as its factorization.

290401921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809278.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 290401921 is about 17041.1830868634. The cubic root of 290401921 is about 662.2162418831.

The spelling of 290401921 in words is "two hundred ninety million, four hundred one thousand, nine hundred twenty-one".