40023290 has 8 divisors (see below), whose sum is σ = 72041940. Its totient is φ = 16009312.

The previous prime is 40023229. The next prime is 40023311. The reversal of 40023290 is 9232004.

It can be written as a sum of positive squares in 2 ways, for example, as 34774609 + 5248681 = 5897^2 + 2291^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001155 + ... + 2001174.

Almost surely, 2^40023290 is an apocalyptic number.

40023290 is a deficient number, since it is larger than the sum of its proper divisors (32018650).

40023290 is a wasteful number, since it uses less digits than its factorization.

40023290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4002336.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40023290 is about 6326.3962885674. The cubic root of 40023290 is about 342.0615520234.

Adding to 40023290 its reverse (9232004), we get a palindrome (49255294).

The spelling of 40023290 in words is "forty million, twenty-three thousand, two hundred ninety".