40345644 has 24 divisors (see below), whose sum is σ = 95684848. Its totient is φ = 13227840.

The previous prime is 40345637. The next prime is 40345649. The reversal of 40345644 is 44654304.

It is not an unprimeable number, because it can be changed into a prime (40345649) 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 7 ways as a sum of consecutive naturals, for example, 26827 + ... + 28290.

Almost surely, 2^40345644 is an apocalyptic number.

It is an amenable number.

40345644 is an abundant number, since it is smaller than the sum of its proper divisors (55339204).

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

40345644 is a wasteful number, since it uses less digits than its factorization.

40345644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55185 (or 55183 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 40345644 is about 6351.8221007834. The cubic root of 40345644 is about 342.9774370547.

Adding to 40345644 its reverse (44654304), we get a palindrome (84999948).

The spelling of 40345644 in words is "forty million, three hundred forty-five thousand, six hundred forty-four".