849135640 has 16 divisors (see below), whose sum is σ = 1910555280. Its totient is φ = 339654240.

The previous prime is 849135613. The next prime is 849135667. The reversal of 849135640 is 46531948.

It is an interprime number because it is at equal distance from previous prime (849135613) and next prime (849135667).

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 21228391 = 849135640 / (8 + 4 + 9 + 1 + 3 + 5 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 849135593 and 849135602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10614156 + ... + 10614235.

It is an arithmetic number, because the mean of its divisors is an integer number (119409705).

Almost surely, 2^849135640 is an apocalyptic number.

It is an amenable number.

849135640 is an abundant number, since it is smaller than the sum of its proper divisors (1061419640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

849135640 is a wasteful number, since it uses less digits than its factorization.

849135640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21228402 (or 21228398 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 849135640 is about 29139.9320520828. The cubic root of 849135640 is about 946.9470377866.

It can be divided in two parts, 8491356 and 40, that added together give a square (8491396 = 2914²).

The spelling of 849135640 in words is "eight hundred forty-nine million, one hundred thirty-five thousand, six hundred forty".