37861 has 2 divisors, whose sum is σ = 37862. Its totient is φ = 37860.

The previous prime is 37853. The next prime is 37871. The reversal of 37861 is 16873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37636 + 225 = 194^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 37861 - 2³ = 37853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18930 + 18931.

It is an arithmetic number, because the mean of its divisors is an integer number (18931).

2³⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

37861 is a deficient number, since it is larger than the sum of its proper divisors (1).

37861 is an equidigital number, since it uses as much as digits as its factorization.

37861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 37861 is about 194.5790327862. The cubic root of 37861 is about 33.5787114769.

It can be divided in two parts, 37 and 861, that added together give a palindrome (898).

The spelling of 37861 in words is "thirty-seven thousand, eight hundred sixty-one".