745887421 has 2 divisors, whose sum is σ = 745887422. Its totient is φ = 745887420.

The previous prime is 745887419. The next prime is 745887431. The reversal of 745887421 is 124788547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651525625 + 94361796 = 25525^2 + 9714^2 .

It is a cyclic number.

It is not a de Polignac number, because 745887421 - 2¹ = 745887419 is a prime.

Together with 745887419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745887431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372943710 + 372943711.

It is an arithmetic number, because the mean of its divisors is an integer number (372943711).

Almost surely, 2^745887421 is an apocalyptic number.

It is an amenable number.

745887421 is a deficient number, since it is larger than the sum of its proper divisors (1).

745887421 is an equidigital number, since it uses as much as digits as its factorization.

745887421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 501760, while the sum is 46.

The square root of 745887421 is about 27310.9395847159. The cubic root of 745887421 is about 906.8965735060.

The spelling of 745887421 in words is "seven hundred forty-five million, eight hundred eighty-seven thousand, four hundred twenty-one".