40021500 has 48 divisors (see below), whose sum is σ = 116546976. Its totient is φ = 10672000.

The previous prime is 40021489. The next prime is 40021507. The reversal of 40021500 is 512004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11841 + ... + 14840.

It is an arithmetic number, because the mean of its divisors is an integer number (2428062).

Almost surely, 2^40021500 is an apocalyptic number.

It is an amenable number.

40021500 is an abundant number, since it is smaller than the sum of its proper divisors (76525476).

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

40021500 is a wasteful number, since it uses less digits than its factorization.

40021500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26703 (or 26691 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40021500 is about 6326.2548162400. The cubic root of 40021500 is about 342.0564524984.

Adding to 40021500 its reverse (512004), we get a palindrome (40533504).

The spelling of 40021500 in words is "forty million, twenty-one thousand, five hundred".