290389140 has 72 divisors (see below), whose sum is σ = 889624008. Its totient is φ = 76665600.

The previous prime is 290389123. The next prime is 290389159. The reversal of 290389140 is 41983092.

It can be written as a sum of positive squares in 4 ways, for example, as 132987024 + 157402116 = 11532^2 + 12546^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 290389095 and 290389104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10194 + ... + 26166.

It is an arithmetic number, because the mean of its divisors is an integer number (12355889).

Almost surely, 2^290389140 is an apocalyptic number.

290389140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 290389140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (444812004).

290389140 is an abundant number, since it is smaller than the sum of its proper divisors (599234868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

290389140 is a wasteful number, since it uses less digits than its factorization.

290389140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16089 (or 16084 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 290389140 is about 17040.8080794310. The cubic root of 290389140 is about 662.2065267155.

The spelling of 290389140 in words is "two hundred ninety million, three hundred eighty-nine thousand, one hundred forty".