428039693 has 2 divisors, whose sum is σ = 428039694. Its totient is φ = 428039692.

The previous prime is 428039687. The next prime is 428039737. The reversal of 428039693 is 396930824.

It is an a-pointer prime, because the next prime (428039737) can be obtained adding 428039693 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426546409 + 1493284 = 20653^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 428039693 - 2²⁴ = 411262477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428039653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214019846 + 214019847.

It is an arithmetic number, because the mean of its divisors is an integer number (214019847).

Almost surely, 2^428039693 is an apocalyptic number.

It is an amenable number.

428039693 is a deficient number, since it is larger than the sum of its proper divisors (1).

428039693 is an equidigital number, since it uses as much as digits as its factorization.

428039693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 428039693 is about 20689.1201601228. The cubic root of 428039693 is about 753.6355004487.

The spelling of 428039693 in words is "four hundred twenty-eight million, thirty-nine thousand, six hundred ninety-three".