846649957 has 4 divisors (see below), whose sum is σ = 846722700. Its totient is φ = 846577216.

The previous prime is 846649939. The next prime is 846649967. The reversal of 846649957 is 759946648.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 576672196 + 269977761 = 24014^2 + 16431^2 .

It is a 3-Lehmer number, since φ(846649957) divides (846649957-1)³.

It is a cyclic number.

It is not a de Polignac number, because 846649957 - 2²⁷ = 712432229 is a prime.

It is a super-2 number, since 2×846649957² = 1433632299376203698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (846649907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14548 + ... + 43645.

It is an arithmetic number, because the mean of its divisors is an integer number (211680675).

Almost surely, 2^846649957 is an apocalyptic number.

846649957 is the 14549-th decagonal number.

It is an amenable number.

846649957 is a deficient number, since it is larger than the sum of its proper divisors (72743).

846649957 is a wasteful number, since it uses less digits than its factorization.

846649957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72742.

The product of its digits is 13063680, while the sum is 58.

The square root of 846649957 is about 29097.2499903341. The cubic root of 846649957 is about 946.0221322857.

The spelling of 846649957 in words is "eight hundred forty-six million, six hundred forty-nine thousand, nine hundred fifty-seven".