857509142 has 8 divisors (see below), whose sum is σ = 1470015696. Its totient is φ = 367503912.

The previous prime is 857509141. The next prime is 857509157. The reversal of 857509142 is 241905758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×857509142² = 1470643857227152328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 857509142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857509141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30625313 + ... + 30625340.

It is an arithmetic number, because the mean of its divisors is an integer number (183751962).

Almost surely, 2^857509142 is an apocalyptic number.

857509142 is a deficient number, since it is larger than the sum of its proper divisors (612506554).

857509142 is a wasteful number, since it uses less digits than its factorization.

857509142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61250662.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 857509142 is about 29283.2570251330. The cubic root of 857509142 is about 950.0495420147.

The spelling of 857509142 in words is "eight hundred fifty-seven million, five hundred nine thousand, one hundred forty-two".