240421669 has 2 divisors, whose sum is σ = 240421670. Its totient is φ = 240421668.

The previous prime is 240421613. The next prime is 240421697. The reversal of 240421669 is 966124042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181899169 + 58522500 = 13487^2 + 7650^2 .

It is a cyclic number.

It is not a de Polignac number, because 240421669 - 2²⁷ = 106203941 is a prime.

It is a super-2 number, since 2×240421669² = 115605157849491122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240421609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120210834 + 120210835.

It is an arithmetic number, because the mean of its divisors is an integer number (120210835).

Almost surely, 2^240421669 is an apocalyptic number.

It is an amenable number.

240421669 is a deficient number, since it is larger than the sum of its proper divisors (1).

240421669 is an equidigital number, since it uses as much as digits as its factorization.

240421669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 240421669 is about 15505.5367207975. The cubic root of 240421669 is about 621.8102392567.

The spelling of 240421669 in words is "two hundred forty million, four hundred twenty-one thousand, six hundred sixty-nine".