407861 has 2 divisors, whose sum is σ = 407862. Its totient is φ = 407860.

The previous prime is 407857. The next prime is 407879. The reversal of 407861 is 168704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 323761 + 84100 = 569^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 407861 - 2² = 407857 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 407861.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 407861.

It is not a weakly prime, because it can be changed into another prime (407801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203930 + 203931.

It is an arithmetic number, because the mean of its divisors is an integer number (203931).

2⁴⁰⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

407861 is a deficient number, since it is larger than the sum of its proper divisors (1).

407861 is an equidigital number, since it uses as much as digits as its factorization.

407861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 407861 is about 638.6399611675. The cubic root of 407861 is about 74.1601716878.

The spelling of 407861 in words is "four hundred seven thousand, eight hundred sixty-one".