290423989 has 8 divisors (see below), whose sum is σ = 303165368. Its totient is φ = 277940160.

The previous prime is 290423933. The next prime is 290423993. The reversal of 290423989 is 989324092.

It can be written as a sum of positive squares in 4 ways, for example, as 67519089 + 222904900 = 8217^2 + 14930^2 .

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 290423989 - 2⁹ = 290423477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290423389) 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, 62082 + ... + 66595.

It is an arithmetic number, because the mean of its divisors is an integer number (37895671).

Almost surely, 2^290423989 is an apocalyptic number.

It is an amenable number.

290423989 is a deficient number, since it is larger than the sum of its proper divisors (12741379).

290423989 is a wasteful number, since it uses less digits than its factorization.

290423989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128775.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 290423989 is about 17041.8305648190. The cubic root of 290423989 is about 662.2330156678.

The spelling of 290423989 in words is "two hundred ninety million, four hundred twenty-three thousand, nine hundred eighty-nine".