40243290 has 16 divisors (see below), whose sum is σ = 96583968. Its totient is φ = 10731536.

The previous prime is 40243283. The next prime is 40243303. The reversal of 40243290 is 9234204.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 40243290.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670692 + ... + 670751.

It is an arithmetic number, because the mean of its divisors is an integer number (6036498).

Almost surely, 2^40243290 is an apocalyptic number.

40243290 is an abundant number, since it is smaller than the sum of its proper divisors (56340678).

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

40243290 is a wasteful number, since it uses less digits than its factorization.

40243290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341453.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 40243290 is about 6343.7599261006. The cubic root of 40243290 is about 342.6871550697.

Adding to 40243290 its reverse (9234204), we get a palindrome (49477494).

The spelling of 40243290 in words is "forty million, two hundred forty-three thousand, two hundred ninety".