11880721 has 2 divisors, whose sum is σ = 11880722. Its totient is φ = 11880720.

The previous prime is 11880689. The next prime is 11880733. The reversal of 11880721 is 12708811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 3534400 = 2889^2 + 1880^2 .

It is a cyclic number.

It is not a de Polignac number, because 11880721 - 2⁵ = 11880689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11880721.

It is not a weakly prime, because it can be changed into another prime (11880751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5940360 + 5940361.

It is an arithmetic number, because the mean of its divisors is an integer number (5940361).

Almost surely, 2^11880721 is an apocalyptic number.

It is an amenable number.

11880721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11880721 is an equidigital number, since it uses as much as digits as its factorization.

11880721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 11880721 is about 3446.8421779942. The cubic root of 11880721 is about 228.1817635939.

It can be divided in two parts, 118807 and 21, that added together give a triangular number (118828 = T₄₈₇).

The spelling of 11880721 in words is "eleven million, eight hundred eighty thousand, seven hundred twenty-one".