1397861 has 2 divisors, whose sum is σ = 1397862. Its totient is φ = 1397860.

The previous prime is 1397857. The next prime is 1397873. The reversal of 1397861 is 1687931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 748225 + 649636 = 865^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397861 - 2² = 1397857 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698930 + 698931.

It is an arithmetic number, because the mean of its divisors is an integer number (698931).

2^1397861 is an apocalyptic number.

It is an amenable number.

1397861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397861 is an equidigital number, since it uses as much as digits as its factorization.

1397861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 1397861 is about 1182.3117186258. The cubic root of 1397861 is about 111.8118919381.

It can be divided in two parts, 139 and 7861, that added together give a cube (8000 = 20³).

The spelling of 1397861 in words is "one million, three hundred ninety-seven thousand, eight hundred sixty-one".