7393921 has 2 divisors, whose sum is σ = 7393922. Its totient is φ = 7393920.

The previous prime is 7393913. The next prime is 7393931. The reversal of 7393921 is 1293937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 297025 = 2664^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 7393921 - 2³ = 7393913 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7393901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3696960 + 3696961.

It is an arithmetic number, because the mean of its divisors is an integer number (3696961).

Almost surely, 2^7393921 is an apocalyptic number.

It is an amenable number.

7393921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7393921 is an equidigital number, since it uses as much as digits as its factorization.

7393921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 34.

The square root of 7393921 is about 2719.1765297604. The cubic root of 7393921 is about 194.8161405277.

The spelling of 7393921 in words is "seven million, three hundred ninety-three thousand, nine hundred twenty-one".