290039991 has 16 divisors (see below), whose sum is σ = 404191200. Its totient is φ = 184762368.

The previous prime is 290039989. The next prime is 290040001. The reversal of 290039991 is 199930092.

It is a happy number.

It is not a de Polignac number, because 290039991 - 2¹ = 290039989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290039791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8746 + ... + 25623.

It is an arithmetic number, because the mean of its divisors is an integer number (25261950).

Almost surely, 2^290039991 is an apocalyptic number.

290039991 is a deficient number, since it is larger than the sum of its proper divisors (114151209).

290039991 is a wasteful number, since it uses less digits than its factorization.

290039991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34498.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 290039991 is about 17030.5605016394. The cubic root of 290039991 is about 661.9410192278.

The spelling of 290039991 in words is "two hundred ninety million, thirty-nine thousand, nine hundred ninety-one".