5128749 has 6 divisors (see below), whose sum is σ = 7408206. Its totient is φ = 3419160.

The previous prime is 5128723. The next prime is 5128751. The reversal of 5128749 is 9478215.

It can be written as a sum of positive squares in only one way, i.e., 4652649 + 476100 = 2157^2 + 690^2 .

It is not a de Polignac number, because 5128749 - 2⁸ = 5128493 is a prime.

5128749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5128789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 284922 + ... + 284939.

It is an arithmetic number, because the mean of its divisors is an integer number (1234701).

Almost surely, 2^5128749 is an apocalyptic number.

It is an amenable number.

5128749 is a deficient number, since it is larger than the sum of its proper divisors (2279457).

5128749 is a wasteful number, since it uses less digits than its factorization.

5128749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569867 (or 569864 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 5128749 is about 2264.6741487463. The cubic root of 5128749 is about 172.4528919884.

It can be divided in two parts, 512 and 8749, that added together give a cube (9261 = 21³).

The spelling of 5128749 in words is "five million, one hundred twenty-eight thousand, seven hundred forty-nine".