40213644 has 36 divisors (see below), whose sum is σ = 95715816. Its totient is φ = 13140608.

The previous prime is 40213639. The next prime is 40213651. The reversal of 40213644 is 44631204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33112 + ... + 34304.

Almost surely, 2^40213644 is an apocalyptic number.

It is an amenable number.

40213644 is an abundant number, since it is smaller than the sum of its proper divisors (55502172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40213644 is a wasteful number, since it uses less digits than its factorization.

40213644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306 (or 1251 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 40213644 is about 6341.4228687259. The cubic root of 40213644 is about 342.6029853518.

Adding to 40213644 its reverse (44631204), we get a palindrome (84844848).

The spelling of 40213644 in words is "forty million, two hundred thirteen thousand, six hundred forty-four".