40021724 has 6 divisors (see below), whose sum is σ = 70038024. Its totient is φ = 20010860.

The previous prime is 40021703. The next prime is 40021727. The reversal of 40021724 is 42712004.

It is a junction number, because it is equal to n+sod(n) for n = 40021696 and 40021705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5002712 + ... + 5002719.

It is an arithmetic number, because the mean of its divisors is an integer number (11673004).

Almost surely, 2^40021724 is an apocalyptic number.

It is an amenable number.

40021724 is a deficient number, since it is larger than the sum of its proper divisors (30016300).

40021724 is a wasteful number, since it uses less digits than its factorization.

40021724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10005435 (or 10005433 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 40021724 is about 6326.2725202128. The cubic root of 40021724 is about 342.0570906596.

Adding to 40021724 its reverse (42712004), we get a palindrome (82733728).

The spelling of 40021724 in words is "forty million, twenty-one thousand, seven hundred twenty-four".