7121397 has 8 divisors (see below), whose sum is σ = 9565056. Its totient is φ = 4712672.

The previous prime is 7121377. The next prime is 7121399. The reversal of 7121397 is 7931217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7121397 - 2⁸ = 7121141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7121399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8253 + ... + 9074.

It is an arithmetic number, because the mean of its divisors is an integer number (1195632).

Almost surely, 2^7121397 is an apocalyptic number.

It is an amenable number.

7121397 is a deficient number, since it is larger than the sum of its proper divisors (2443659).

7121397 is a wasteful number, since it uses less digits than its factorization.

7121397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17467.

The product of its digits is 2646, while the sum is 30.

The square root of 7121397 is about 2668.5945739284. The cubic root of 7121397 is about 192.3926156573.

The spelling of 7121397 in words is "seven million, one hundred twenty-one thousand, three hundred ninety-seven".