1140721 has 2 divisors, whose sum is σ = 1140722. Its totient is φ = 1140720.

The previous prime is 1140709. The next prime is 1140749. The reversal of 1140721 is 1270411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 950625 + 190096 = 975^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1140721 - 2¹¹ = 1138673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1140695 and 1140704.

It is not a weakly prime, because it can be changed into another prime (1140121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570360 + 570361.

It is an arithmetic number, because the mean of its divisors is an integer number (570361).

2^1140721 is an apocalyptic number.

It is an amenable number.

1140721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1140721 is an equidigital number, since it uses as much as digits as its factorization.

1140721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 1140721 is about 1068.0454110196. The cubic root of 1140721 is about 104.4864110899.

It can be divided in two parts, 11 and 40721, that multiplied together give a triangular number (447931 = T₉₄₆).

The spelling of 1140721 in words is "one million, one hundred forty thousand, seven hundred twenty-one".