40213312 has 28 divisors (see below), whose sum is σ = 80352900. Its totient is φ = 19966976.

The previous prime is 40213309. The next prime is 40213319. The reversal of 40213312 is 21331204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20286016 + 19927296 = 4504^2 + 4464^2 .

It is a super-2 number, since 2×40213312² = 3234220924018688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40213319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7428 + ... + 11644.

Almost surely, 2^40213312 is an apocalyptic number.

It is an amenable number.

40213312 is a deficient number, since it is larger than the sum of its proper divisors (40139588).

40213312 is a wasteful number, since it uses less digits than its factorization.

40213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4378 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40213312 is about 6341.3966915814. The cubic root of 40213312 is about 342.6020425167.

Adding to 40213312 its reverse (21331204), we get a palindrome (61544516).

The spelling of 40213312 in words is "forty million, two hundred thirteen thousand, three hundred twelve".