290906257 has 4 divisors (see below), whose sum is σ = 292176820. Its totient is φ = 289635696.

The previous prime is 290906251. The next prime is 290906303. The reversal of 290906257 is 752609092.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 276091456 + 14814801 = 16616^2 + 3849^2 .

It is a cyclic number.

It is not a de Polignac number, because 290906257 - 2¹¹ = 290904209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290906251) 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, 634938 + ... + 635395.

It is an arithmetic number, because the mean of its divisors is an integer number (73044205).

Almost surely, 2^290906257 is an apocalyptic number.

It is an amenable number.

290906257 is a deficient number, since it is larger than the sum of its proper divisors (1270563).

290906257 is a wasteful number, since it uses less digits than its factorization.

290906257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270562.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 290906257 is about 17055.9742319224. The cubic root of 290906257 is about 662.5993733455.

The spelling of 290906257 in words is "two hundred ninety million, nine hundred six thousand, two hundred fifty-seven".