40505618 has 4 divisors (see below), whose sum is σ = 60758430. Its totient is φ = 20252808.

The previous prime is 40505617. The next prime is 40505629. The reversal of 40505618 is 81650504.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 20729809 + 19775809 = 4553^2 + 4447^2 .

It is not an unprimeable number, because it can be changed into a prime (40505617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10126403 + ... + 10126406.

Almost surely, 2^40505618 is an apocalyptic number.

40505618 is a deficient number, since it is larger than the sum of its proper divisors (20252812).

40505618 is a wasteful number, since it uses less digits than its factorization.

40505618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20252811.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 40505618 is about 6364.4024071393. The cubic root of 40505618 is about 343.4301510556.

It can be divided in two parts, 4050 and 5618, that multiplied together give a square (22752900 = 4770²).

The spelling of 40505618 in words is "forty million, five hundred five thousand, six hundred eighteen".