857387540 has 48 divisors (see below), whose sum is σ = 1905361920. Its totient is φ = 323176320.

The previous prime is 857387473. The next prime is 857387591. The reversal of 857387540 is 45783758.

It is a happy number.

It is a super-2 number, since 2×857387540² = 1470226787494503200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66674 + ... + 78486.

It is an arithmetic number, because the mean of its divisors is an integer number (39695040).

Almost surely, 2^857387540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857387540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952680960).

857387540 is an abundant number, since it is smaller than the sum of its proper divisors (1047974380).

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

857387540 is a wasteful number, since it uses less digits than its factorization.

857387540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12032 (or 12030 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 47.

The square root of 857387540 is about 29281.1806455956. The cubic root of 857387540 is about 950.0046315564.

The spelling of 857387540 in words is "eight hundred fifty-seven million, three hundred eighty-seven thousand, five hundred forty".