1970857 has 4 divisors (see below), whose sum is σ = 2252416. Its totient is φ = 1689300.

The previous prime is 1970809. The next prime is 1970867. The reversal of 1970857 is 7580791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7580791 = 19 ⋅398989.

It is a cyclic number.

It is not a de Polignac number, because 1970857 - 2⁷ = 1970729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1970867) 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, 140769 + ... + 140782.

It is an arithmetic number, because the mean of its divisors is an integer number (563104).

2^1970857 is an apocalyptic number.

It is an amenable number.

1970857 is a deficient number, since it is larger than the sum of its proper divisors (281559).

1970857 is an equidigital number, since it uses as much as digits as its factorization.

1970857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281558.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 1970857 is about 1403.8721451756. The cubic root of 1970857 is about 125.3771436238.

It can be divided in two parts, 19 and 70857, that added together give a triangular number (70876 = T₃₇₆).

The spelling of 1970857 in words is "one million, nine hundred seventy thousand, eight hundred fifty-seven".