40290 has 32 divisors (see below), whose sum is σ = 103680. Its totient is φ = 9984.

The previous prime is 40289. The next prime is 40343. The reversal of 40290 is 9204.

40290 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471 + ... + 549.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

2⁴⁰²⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51840).

40290 is an abundant number, since it is smaller than the sum of its proper divisors (63390).

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

40290 is a wasteful number, since it uses less digits than its factorization.

40290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 40290 is about 200.7236906795. The cubic root of 40290 is about 34.2819688369.

Adding to 40290 its reverse (9204), we get a palindrome (49494).

The spelling of 40290 in words is "forty thousand, two hundred ninety".