35820821 has 4 divisors (see below), whose sum is σ = 37378272. Its totient is φ = 34263372.

The previous prime is 35820797. The next prime is 35820823. The reversal of 35820821 is 12802853.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-35820821 is a prime.

It is a super-2 number, since 2×35820821² = 2566262434228082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35820823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778691 + ... + 778736.

It is an arithmetic number, because the mean of its divisors is an integer number (9344568).

Almost surely, 2^35820821 is an apocalyptic number.

It is an amenable number.

35820821 is a deficient number, since it is larger than the sum of its proper divisors (1557451).

35820821 is a wasteful number, since it uses less digits than its factorization.

35820821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557450.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 35820821 is about 5985.0497909374. The cubic root of 35820821 is about 329.6440023819.

The spelling of 35820821 in words is "thirty-five million, eight hundred twenty thousand, eight hundred twenty-one".