7121407 has 2 divisors, whose sum is σ = 7121408. Its totient is φ = 7121406.

The previous prime is 7121399. The next prime is 7121417. The reversal of 7121407 is 7041217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7121407 - 2³ = 7121399 is a prime.

7121407 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7121417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3560703 + 3560704.

It is an arithmetic number, because the mean of its divisors is an integer number (3560704).

Almost surely, 2^7121407 is an apocalyptic number.

7121407 is a deficient number, since it is larger than the sum of its proper divisors (1).

7121407 is an equidigital number, since it uses as much as digits as its factorization.

7121407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 7121407 is about 2668.5964475731. The cubic root of 7121407 is about 192.3927057111.

The spelling of 7121407 in words is "seven million, one hundred twenty-one thousand, four hundred seven".