1367721 has 6 divisors (see below), whose sum is σ = 1975610. Its totient is φ = 911808.

The previous prime is 1367713. The next prime is 1367749. The reversal of 1367721 is 1277631.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 68121 = 1140^2 + 261^2 .

It is not a de Polignac number, because 1367721 - 2³ = 1367713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1367711) 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, 75976 + ... + 75993.

2^1367721 is an apocalyptic number.

It is an amenable number.

1367721 is a deficient number, since it is larger than the sum of its proper divisors (607889).

1367721 is a wasteful number, since it uses less digits than its factorization.

1367721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151975 (or 151972 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 1367721 is about 1169.4960453118. The cubic root of 1367721 is about 111.0024348139.

The spelling of 1367721 in words is "one million, three hundred sixty-seven thousand, seven hundred twenty-one".