40021630 has 16 divisors (see below), whose sum is σ = 78588144. Its totient is φ = 14553280.

The previous prime is 40021627. The next prime is 40021661. The reversal of 40021630 is 3612004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181807 + ... + 182026.

It is an arithmetic number, because the mean of its divisors is an integer number (4911759).

Almost surely, 2^40021630 is an apocalyptic number.

40021630 is a deficient number, since it is larger than the sum of its proper divisors (38566514).

40021630 is a wasteful number, since it uses less digits than its factorization.

40021630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363851.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40021630 is about 6326.2650908731. The cubic root of 40021630 is about 342.0568228601.

Adding to 40021630 its reverse (3612004), we get a palindrome (43633634).

The spelling of 40021630 in words is "forty million, twenty-one thousand, six hundred thirty".