438855661 has 2 divisors, whose sum is σ = 438855662. Its totient is φ = 438855660.

The previous prime is 438855647. The next prime is 438855689. The reversal of 438855661 is 166558834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299497636 + 139358025 = 17306^2 + 11805^2 .

It is a cyclic number.

It is not a de Polignac number, because 438855661 - 2¹⁷ = 438724589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438855061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219427830 + 219427831.

It is an arithmetic number, because the mean of its divisors is an integer number (219427831).

Almost surely, 2^438855661 is an apocalyptic number.

It is an amenable number.

438855661 is a deficient number, since it is larger than the sum of its proper divisors (1).

438855661 is an equidigital number, since it uses as much as digits as its factorization.

438855661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 46.

The square root of 438855661 is about 20948.8820942789. The cubic root of 438855661 is about 759.9305459383.

The spelling of 438855661 in words is "four hundred thirty-eight million, eight hundred fifty-five thousand, six hundred sixty-one".