857284440 has 32 divisors (see below), whose sum is σ = 2571853680. Its totient is φ = 228609152.

The previous prime is 857284433. The next prime is 857284469. The reversal of 857284440 is 44482758.

857284440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×857284440² = 1469873222132227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 857284392 and 857284401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3571899 + ... + 3572138.

Almost surely, 2^857284440 is an apocalyptic number.

It is an amenable number.

857284440 is an abundant number, since it is smaller than the sum of its proper divisors (1714569240).

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

857284440 is a wasteful number, since it uses less digits than its factorization.

857284440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144051 (or 7144047 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 42.

The square root of 857284440 is about 29279.4200762242. The cubic root of 857284440 is about 949.9665509922.

The spelling of 857284440 in words is "eight hundred fifty-seven million, two hundred eighty-four thousand, four hundred forty".