6921725 has 6 divisors (see below), whose sum is σ = 8582970. Its totient is φ = 5537360.

The previous prime is 6921709. The next prime is 6921727. The reversal of 6921725 is 5271296.

It can be written as a sum of positive squares in 3 ways, for example, as 151321 + 6770404 = 389^2 + 2602^2 .

It is not a de Polignac number, because 6921725 - 2⁴ = 6921709 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6921691 and 6921700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138410 + ... + 138459.

It is an arithmetic number, because the mean of its divisors is an integer number (1430495).

Almost surely, 2^6921725 is an apocalyptic number.

It is an amenable number.

6921725 is a deficient number, since it is larger than the sum of its proper divisors (1661245).

6921725 is a wasteful number, since it uses less digits than its factorization.

6921725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276879 (or 276874 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 6921725 is about 2630.9171404664. The cubic root of 6921725 is about 190.5774216114.

The spelling of 6921725 in words is "six million, nine hundred twenty-one thousand, seven hundred twenty-five".