35866821 has 16 divisors (see below), whose sum is σ = 52838784. Its totient is φ = 21525504.

The previous prime is 35866811. The next prime is 35866847. The reversal of 35866821 is 12866853.

It is a happy number.

It is not a de Polignac number, because 35866821 - 2⁷ = 35866693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 35866821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35866811) 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, 14116 + ... + 16461.

It is an arithmetic number, because the mean of its divisors is an integer number (3302424).

Almost surely, 2^35866821 is an apocalyptic number.

It is an amenable number.

35866821 is a deficient number, since it is larger than the sum of its proper divisors (16971963).

35866821 is a wasteful number, since it uses less digits than its factorization.

35866821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30620.

The product of its digits is 69120, while the sum is 39.

The square root of 35866821 is about 5988.8914667073. The cubic root of 35866821 is about 329.7850482636.

The spelling of 35866821 in words is "thirty-five million, eight hundred sixty-six thousand, eight hundred twenty-one".