40438366 has 4 divisors (see below), whose sum is σ = 60657552. Its totient is φ = 20219182.

The previous prime is 40438357. The next prime is 40438367. The reversal of 40438366 is 66383404.

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

It is a super-2 number, since 2×40438366² = 3270522889499912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40438367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109590 + ... + 10109593.

It is an arithmetic number, because the mean of its divisors is an integer number (15164388).

Almost surely, 2^40438366 is an apocalyptic number.

40438366 is a deficient number, since it is larger than the sum of its proper divisors (20219186).

40438366 is a wasteful number, since it uses less digits than its factorization.

40438366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20219185.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 40438366 is about 6359.1167625701. The cubic root of 40438366 is about 343.2399785983.

It can be divided in two parts, 40438 and 366, that added together give a palindrome (40804).

The spelling of 40438366 in words is "forty million, four hundred thirty-eight thousand, three hundred sixty-six".