40023545 has 4 divisors (see below), whose sum is σ = 48028260. Its totient is φ = 32018832.

The previous prime is 40023499. The next prime is 40023551. The reversal of 40023545 is 54532004.

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 10549504 + 29474041 = 3248^2 + 5429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40023545 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40023545.

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, 4002350 + ... + 4002359.

It is an arithmetic number, because the mean of its divisors is an integer number (12007065).

Almost surely, 2^40023545 is an apocalyptic number.

It is an amenable number.

40023545 is a deficient number, since it is larger than the sum of its proper divisors (8004715).

40023545 is an equidigital number, since it uses as much as digits as its factorization.

40023545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004714.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 40023545 is about 6326.4164421891. The cubic root of 40023545 is about 342.0622784797.

Adding to 40023545 its reverse (54532004), we get a palindrome (94555549).

The spelling of 40023545 in words is "forty million, twenty-three thousand, five hundred forty-five".