40009924 has 6 divisors (see below), whose sum is σ = 70017374. Its totient is φ = 20004960.

The previous prime is 40009873. The next prime is 40009943. The reversal of 40009924 is 42990004.

It can be written as a sum of positive squares in only one way, i.e., 27899524 + 12110400 = 5282^2 + 3480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 40009892 and 40009901.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001237 + ... + 5001244.

Almost surely, 2^40009924 is an apocalyptic number.

It is an amenable number.

40009924 is a deficient number, since it is larger than the sum of its proper divisors (30007450).

40009924 is a wasteful number, since it uses less digits than its factorization.

40009924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10002485 (or 10002483 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 40009924 is about 6325.3398327679. The cubic root of 40009924 is about 342.0234699988.

Adding to 40009924 its reverse (42990004), we get a palindrome (82999928).

It can be divided in two parts, 4000 and 9924, that added together give a square (13924 = 118²).

The spelling of 40009924 in words is "forty million, nine thousand, nine hundred twenty-four".