290120721 has 8 divisors (see below), whose sum is σ = 421993824. Its totient is φ = 175830720.

The previous prime is 290120713. The next prime is 290120729. The reversal of 290120721 is 127021092.

It is an interprime number because it is at equal distance from previous prime (290120713) and next prime (290120729).

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

It is not a de Polignac number, because 290120721 - 2³ = 290120713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 290120691 and 290120700.

It is not an unprimeable number, because it can be changed into a prime (290120729) 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 7 ways as a sum of consecutive naturals, for example, 4395736 + ... + 4395801.

It is an arithmetic number, because the mean of its divisors is an integer number (52749228).

Almost surely, 2^290120721 is an apocalyptic number.

It is an amenable number.

290120721 is a deficient number, since it is larger than the sum of its proper divisors (131873103).

290120721 is a wasteful number, since it uses less digits than its factorization.

290120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8791551.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 290120721 is about 17032.9304877346. The cubic root of 290120721 is about 662.0024286229.

The spelling of 290120721 in words is "two hundred ninety million, one hundred twenty thousand, seven hundred twenty-one".