438820691 has 2 divisors, whose sum is σ = 438820692. Its totient is φ = 438820690.

The previous prime is 438820667. The next prime is 438820729. The reversal of 438820691 is 196028834.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-438820691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (438820621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219410345 + 219410346.

It is an arithmetic number, because the mean of its divisors is an integer number (219410346).

Almost surely, 2^438820691 is an apocalyptic number.

438820691 is a deficient number, since it is larger than the sum of its proper divisors (1).

438820691 is an equidigital number, since it uses as much as digits as its factorization.

438820691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 438820691 is about 20948.0474269083. The cubic root of 438820691 is about 759.9103605034.

The spelling of 438820691 in words is "four hundred thirty-eight million, eight hundred twenty thousand, six hundred ninety-one".