7389887 has 4 divisors (see below), whose sum is σ = 7398336. Its totient is φ = 7381440.

The previous prime is 7389871. The next prime is 7389901. The reversal of 7389887 is 7889837.

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

It is a cyclic number.

It is not a de Polignac number, because 7389887 - 2⁴ = 7389871 is a prime.

It is a super-2 number, since 2×7389887² = 109220859745538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7389817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2738 + ... + 4719.

It is an arithmetic number, because the mean of its divisors is an integer number (1849584).

Almost surely, 2^7389887 is an apocalyptic number.

7389887 is a deficient number, since it is larger than the sum of its proper divisors (8449).

7389887 is an equidigital number, since it uses as much as digits as its factorization.

7389887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448.

The product of its digits is 677376, while the sum is 50.

The square root of 7389887 is about 2718.4346598732. The cubic root of 7389887 is about 194.7807046033.

Subtracting from 7389887 its sum of digits (50), we obtain a palindrome (7389837).

The spelling of 7389887 in words is "seven million, three hundred eighty-nine thousand, eight hundred eighty-seven".