438680861 has 2 divisors, whose sum is σ = 438680862. Its totient is φ = 438680860.

The previous prime is 438680857. The next prime is 438680867. The reversal of 438680861 is 168086834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 338780836 + 99900025 = 18406^2 + 9995^2 .

It is a cyclic number.

It is not a de Polignac number, because 438680861 - 2² = 438680857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438680867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219340430 + 219340431.

It is an arithmetic number, because the mean of its divisors is an integer number (219340431).

Almost surely, 2^438680861 is an apocalyptic number.

It is an amenable number.

438680861 is a deficient number, since it is larger than the sum of its proper divisors (1).

438680861 is an equidigital number, since it uses as much as digits as its factorization.

438680861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 438680861 is about 20944.7096184215. The cubic root of 438680861 is about 759.8296369063.

The spelling of 438680861 in words is "four hundred thirty-eight million, six hundred eighty thousand, eight hundred sixty-one".