2421989 has 2 divisors, whose sum is σ = 2421990. Its totient is φ = 2421988.

The previous prime is 2421971. The next prime is 2421997. The reversal of 2421989 is 9891242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1481089 + 940900 = 1217^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2421989 - 2⁸ = 2421733 is a prime.

It is a super-2 number, since 2×2421989² = 11732061432242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2421919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1210994 + 1210995.

It is an arithmetic number, because the mean of its divisors is an integer number (1210995).

2^2421989 is an apocalyptic number.

It is an amenable number.

2421989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2421989 is an equidigital number, since it uses as much as digits as its factorization.

2421989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 2421989 is about 1556.2740761190. The cubic root of 2421989 is about 134.2942409275.

The spelling of 2421989 in words is "two million, four hundred twenty-one thousand, nine hundred eighty-nine".