7213889 has 4 divisors (see below), whose sum is σ = 7367424. Its totient is φ = 7060356.

The previous prime is 7213861. The next prime is 7213897. The reversal of 7213889 is 9883127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9883127 = 179 ⋅55213.

It is a cyclic number.

It is not a de Polignac number, because 7213889 - 2¹² = 7209793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7213819) 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, 76697 + ... + 76790.

It is an arithmetic number, because the mean of its divisors is an integer number (1841856).

Almost surely, 2^7213889 is an apocalyptic number.

It is an amenable number.

7213889 is a deficient number, since it is larger than the sum of its proper divisors (153535).

7213889 is a wasteful number, since it uses less digits than its factorization.

7213889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153534.

The product of its digits is 24192, while the sum is 38.

The square root of 7213889 is about 2685.8683884360. The cubic root of 7213889 is about 193.2219608910.

It can be divided in two parts, 72138 and 89, that added together give a palindrome (72227).

The spelling of 7213889 in words is "seven million, two hundred thirteen thousand, eight hundred eighty-nine".