40204145 has 4 divisors (see below), whose sum is σ = 48244980. Its totient is φ = 32163312.

The previous prime is 40204141. The next prime is 40204147. The reversal of 40204145 is 54140204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8202496 + 32001649 = 2864^2 + 5657^2 .

It is a cyclic number.

It is not a de Polignac number, because 40204145 - 2² = 40204141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40204141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4020410 + ... + 4020419.

It is an arithmetic number, because the mean of its divisors is an integer number (12061245).

Almost surely, 2^40204145 is an apocalyptic number.

It is an amenable number.

40204145 is a deficient number, since it is larger than the sum of its proper divisors (8040835).

40204145 is an equidigital number, since it uses as much as digits as its factorization.

40204145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040834.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40204145 is about 6340.6738600877. The cubic root of 40204145 is about 342.5760074266.

Adding to 40204145 its reverse (54140204), we get a palindrome (94344349).

The spelling of 40204145 in words is "forty million, two hundred four thousand, one hundred forty-five".