438656693 has 2 divisors, whose sum is σ = 438656694. Its totient is φ = 438656692.

The previous prime is 438656653. The next prime is 438656723. The reversal of 438656693 is 396656834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 334963204 + 103693489 = 18302^2 + 10183^2 .

It is a cyclic number.

It is not a de Polignac number, because 438656693 - 2¹⁸ = 438394549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438656653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219328346 + 219328347.

It is an arithmetic number, because the mean of its divisors is an integer number (219328347).

Almost surely, 2^438656693 is an apocalyptic number.

It is an amenable number.

438656693 is a deficient number, since it is larger than the sum of its proper divisors (1).

438656693 is an equidigital number, since it uses as much as digits as its factorization.

438656693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 50.

The square root of 438656693 is about 20944.1326628724. The cubic root of 438656693 is about 759.8156830265.

The spelling of 438656693 in words is "four hundred thirty-eight million, six hundred fifty-six thousand, six hundred ninety-three".