40021835 has 8 divisors (see below), whose sum is σ = 54887136. Its totient is φ = 27443520.

The previous prime is 40021819. The next prime is 40021841. The reversal of 40021835 is 53812004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40021835 - 2⁴ = 40021819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40021835.

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, 571706 + ... + 571775.

It is an arithmetic number, because the mean of its divisors is an integer number (6860892).

Almost surely, 2^40021835 is an apocalyptic number.

40021835 is a deficient number, since it is larger than the sum of its proper divisors (14865301).

40021835 is a wasteful number, since it uses less digits than its factorization.

40021835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143493.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 40021835 is about 6326.2812931453. The cubic root of 40021835 is about 342.0574068904.

Adding to 40021835 its reverse (53812004), we get a palindrome (93833839).

The spelling of 40021835 in words is "forty million, twenty-one thousand, eight hundred thirty-five".