40021330 has 16 divisors (see below), whose sum is σ = 73796184. Its totient is φ = 15617920.

The previous prime is 40021313. The next prime is 40021337. The reversal of 40021330 is 3312004.

It can be written as a sum of positive squares in 4 ways, for example, as 29452329 + 10569001 = 5427^2 + 3251^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40021330.

It is not an unprimeable number, because it can be changed into a prime (40021337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48397 + ... + 49216.

Almost surely, 2^40021330 is an apocalyptic number.

40021330 is a deficient number, since it is larger than the sum of its proper divisors (33774854).

40021330 is a wasteful number, since it uses less digits than its factorization.

40021330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97661.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40021330 is about 6326.2413801562. The cubic root of 40021330 is about 342.0559681781.

Adding to 40021330 its reverse (3312004), we get a palindrome (43333334).

The spelling of 40021330 in words is "forty million, twenty-one thousand, three hundred thirty".