857040442 has 4 divisors (see below), whose sum is σ = 1285560666. Its totient is φ = 428520220.

The previous prime is 857040413. The next prime is 857040469. The reversal of 857040442 is 244040758.

It is a happy number.

857040442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 856791441 + 249001 = 29271^2 + 499^2 .

It is a junction number, because it is equal to n+sod(n) for n = 857040398 and 857040407.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214260109 + ... + 214260112.

Almost surely, 2^857040442 is an apocalyptic number.

857040442 is a deficient number, since it is larger than the sum of its proper divisors (428520224).

857040442 is a wasteful number, since it uses less digits than its factorization.

857040442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428520223.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 857040442 is about 29275.2530646620. The cubic root of 857040442 is about 949.8764167957.

The spelling of 857040442 in words is "eight hundred fifty-seven million, forty thousand, four hundred forty-two".