1973857 has 2 divisors, whose sum is σ = 1973858. Its totient is φ = 1973856.

The previous prime is 1973831. The next prime is 1973893. The reversal of 1973857 is 7583791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1201216 + 772641 = 1096^2 + 879^2 .

It is an emirp because it is prime and its reverse (7583791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1973857 - 2¹⁵ = 1941089 is a prime.

It is a super-2 number, since 2×1973857² = 7792222912898, which contains 22 as substring.

1973857 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1973897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986928 + 986929.

It is an arithmetic number, because the mean of its divisors is an integer number (986929).

2^1973857 is an apocalyptic number.

It is an amenable number.

1973857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973857 is an equidigital number, since it uses as much as digits as its factorization.

1973857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 40.

The square root of 1973857 is about 1404.9402122510. The cubic root of 1973857 is about 125.4407269187.

The spelling of 1973857 in words is "one million, nine hundred seventy-three thousand, eight hundred fifty-seven".