1860721 has 2 divisors, whose sum is σ = 1860722. Its totient is φ = 1860720.

The previous prime is 1860709. The next prime is 1860731. The reversal of 1860721 is 1270681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1860496 + 225 = 1364^2 + 15^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860721 - 2¹⁵ = 1827953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1860731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930360 + 930361.

It is an arithmetic number, because the mean of its divisors is an integer number (930361).

2^1860721 is an apocalyptic number.

It is an amenable number.

1860721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1860721 is an equidigital number, since it uses as much as digits as its factorization.

1860721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1860721 is about 1364.0824755124. The cubic root of 1860721 is about 122.9967831357.

The spelling of 1860721 in words is "one million, eight hundred sixty thousand, seven hundred twenty-one".