849942017929 has 9 divisors (see below), whose sum is σ = 853574123559. Its totient is φ = 846325314000.

The previous prime is 849942017921. The next prime is 849942017941. The reversal of 849942017929 is 929710249948.

It is a happy number.

The square root of 849942017929 is 921923.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 55077049225 + 794864968704 = 234685^2 + 891552^2 .

It is not a de Polignac number, because 849942017929 - 2³ = 849942017921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (849942017921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 231400837 + ... + 231404509.

Almost surely, 2^849942017929 is an apocalyptic number.

849942017929 is the 921923-rd square number.

849942017929 is the 460962-nd centered octagonal number.

It is an amenable number.

849942017929 is a deficient number, since it is larger than the sum of its proper divisors (3632105630).

849942017929 is an frugal number, since it uses more digits than its factorization.

849942017929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7848 (or 3924 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 64.

Multiplying 849942017929 by its sum of digits (64), we get a square (54396289147456 = 7375384²).

The spelling of 849942017929 in words is "eight hundred forty-nine billion, nine hundred forty-two million, seventeen thousand, nine hundred twenty-nine".