7312921 has 16 divisors (see below), whose sum is σ = 9249408. Its totient is φ = 5616000.

The previous prime is 7312913. The next prime is 7312933. The reversal of 7312921 is 1292137.

It is a cyclic number.

It is not a de Polignac number, because 7312921 - 2³ = 7312913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7312961) 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 15 ways as a sum of consecutive naturals, for example, 4971 + ... + 6271.

It is an arithmetic number, because the mean of its divisors is an integer number (578088).

Almost surely, 2^7312921 is an apocalyptic number.

It is an amenable number.

7312921 is a deficient number, since it is larger than the sum of its proper divisors (1936487).

7312921 is a wasteful number, since it uses less digits than its factorization.

7312921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392.

The product of its digits is 756, while the sum is 25.

The square root of 7312921 is about 2704.2412984052. The cubic root of 7312921 is about 194.1021267647.

The spelling of 7312921 in words is "seven million, three hundred twelve thousand, nine hundred twenty-one".