745021889 has 8 divisors (see below), whose sum is σ = 792854568. Its totient is φ = 697634560.

The previous prime is 745021877. The next prime is 745021897. The reversal of 745021889 is 988120547.

It can be written as a sum of positive squares in 4 ways, for example, as 619761025 + 125260864 = 24895^2 + 11192^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745021889 - 2⁴ = 745021873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (745021489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107882 + ... + 114579.

It is an arithmetic number, because the mean of its divisors is an integer number (99106821).

Almost surely, 2^745021889 is an apocalyptic number.

It is an amenable number.

745021889 is a deficient number, since it is larger than the sum of its proper divisors (47832679).

745021889 is a wasteful number, since it uses less digits than its factorization.

745021889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222675.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 745021889 is about 27295.0891004224. The cubic root of 745021889 is about 906.5456484208.

The spelling of 745021889 in words is "seven hundred forty-five million, twenty-one thousand, eight hundred eighty-nine".