290257993 has 8 divisors (see below), whose sum is σ = 297309600. Its totient is φ = 283277568.

The previous prime is 290257967. The next prime is 290258009. The reversal of 290257993 is 399752092.

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

It is a cyclic number.

It is not a de Polignac number, because 290257993 - 2⁹ = 290257481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290257963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9496 + ... + 25897.

It is an arithmetic number, because the mean of its divisors is an integer number (37163700).

Almost surely, 2^290257993 is an apocalyptic number.

It is an amenable number.

290257993 is a deficient number, since it is larger than the sum of its proper divisors (7051607).

290257993 is a wasteful number, since it uses less digits than its factorization.

290257993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35591.

The product of its (nonzero) digits is 306180, while the sum is 46.

The square root of 290257993 is about 17036.9596172557. The cubic root of 290257993 is about 662.1068220266.

The spelling of 290257993 in words is "two hundred ninety million, two hundred fifty-seven thousand, nine hundred ninety-three".