290389887 has 8 divisors (see below), whose sum is σ = 430207280. Its totient is φ = 193593240.

The previous prime is 290389877. The next prime is 290389889. The reversal of 290389887 is 788983092.

It is not a de Polignac number, because 290389887 - 2⁴ = 290389871 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 (290389889) 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, 5377564 + ... + 5377617.

It is an arithmetic number, because the mean of its divisors is an integer number (53775910).

Almost surely, 2^290389887 is an apocalyptic number.

290389887 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

290389887 is a deficient number, since it is larger than the sum of its proper divisors (139817393).

290389887 is a wasteful number, since it uses less digits than its factorization.

290389887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10755190 (or 10755184 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 290389887 is about 17040.8299973916. The cubic root of 290389887 is about 662.2070945373.

The spelling of 290389887 in words is "two hundred ninety million, three hundred eighty-nine thousand, eight hundred eighty-seven".