7428889 has 4 divisors (see below), whose sum is σ = 8000356. Its totient is φ = 6857424.

The previous prime is 7428887. The next prime is 7428899. The reversal of 7428889 is 9888247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2175625 + 5253264 = 1475^2 + 2292^2 .

It is a cyclic number.

It is not a de Polignac number, because 7428889 - 2¹ = 7428887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7428887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285714 + ... + 285739.

It is an arithmetic number, because the mean of its divisors is an integer number (2000089).

Almost surely, 2^7428889 is an apocalyptic number.

It is an amenable number.

7428889 is a deficient number, since it is larger than the sum of its proper divisors (571467).

7428889 is a wasteful number, since it uses less digits than its factorization.

7428889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571466.

The product of its digits is 258048, while the sum is 46.

The square root of 7428889 is about 2725.5988332842. The cubic root of 7428889 is about 195.1227716898.

The spelling of 7428889 in words is "seven million, four hundred twenty-eight thousand, eight hundred eighty-nine".