290387940 has 48 divisors (see below), whose sum is σ = 819044352. Its totient is φ = 76869376.

The previous prime is 290387927. The next prime is 290387947. The reversal of 290387940 is 49783092.

It is a junction number, because it is equal to n+sod(n) for n = 290387892 and 290387901.

It is not an unprimeable number, because it can be changed into a prime (290387947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9444 + ... + 25883.

It is an arithmetic number, because the mean of its divisors is an integer number (17063424).

Almost surely, 2^290387940 is an apocalyptic number.

290387940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

290387940 is an abundant number, since it is smaller than the sum of its proper divisors (528656412).

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

290387940 is a wasteful number, since it uses less digits than its factorization.

290387940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35476 (or 35474 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 290387940 is about 17040.7728697967. The cubic root of 290387940 is about 662.2056145500.

The spelling of 290387940 in words is "two hundred ninety million, three hundred eighty-seven thousand, nine hundred forty".