851136440 has 64 divisors (see below), whose sum is σ = 2387612160. Its totient is φ = 265288320.

The previous prime is 851136397. The next prime is 851136449. The reversal of 851136440 is 44631158.

It is a junction number, because it is equal to n+sod(n) for n = 851136397 and 851136406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851136449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135092 + ... + 141251.

It is an arithmetic number, because the mean of its divisors is an integer number (37306440).

Almost surely, 2^851136440 is an apocalyptic number.

It is an amenable number.

851136440 is an abundant number, since it is smaller than the sum of its proper divisors (1536475720).

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

851136440 is a wasteful number, since it uses less digits than its factorization.

851136440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276372 (or 276368 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 851136440 is about 29174.2427493843. The cubic root of 851136440 is about 947.6902113465.

Adding to 851136440 its reverse (44631158), we get a palindrome (895767598).

The spelling of 851136440 in words is "eight hundred fifty-one million, one hundred thirty-six thousand, four hundred forty".