849698021 has 4 divisors (see below), whose sum is σ = 857639232. Its totient is φ = 841756812.

The previous prime is 849698011. The next prime is 849698023. The reversal of 849698021 is 120896948.

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-849698021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849698023) 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, 3970445 + ... + 3970658.

It is an arithmetic number, because the mean of its divisors is an integer number (214409808).

Almost surely, 2^849698021 is an apocalyptic number.

It is an amenable number.

849698021 is a deficient number, since it is larger than the sum of its proper divisors (7941211).

849698021 is a wasteful number, since it uses less digits than its factorization.

849698021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7941210.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 849698021 is about 29149.5801170446. The cubic root of 849698021 is about 947.1560454223.

The spelling of 849698021 in words is "eight hundred forty-nine million, six hundred ninety-eight thousand, twenty-one".