424021781 has 4 divisors (see below), whose sum is σ = 424125600. Its totient is φ = 423917964.

The previous prime is 424021771. The next prime is 424021831. The reversal of 424021781 is 187120424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 424021781 - 2¹⁰ = 424020757 is a prime.

It is a super-2 number, since 2×424021781² = 359588941524823922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (424021771) 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 in 3 ways as a sum of consecutive naturals, for example, 45521 + ... + 54038.

It is an arithmetic number, because the mean of its divisors is an integer number (106031400).

Almost surely, 2^424021781 is an apocalyptic number.

It is an amenable number.

424021781 is a deficient number, since it is larger than the sum of its proper divisors (103819).

424021781 is an equidigital number, since it uses as much as digits as its factorization.

424021781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103818.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 424021781 is about 20591.7891646161. The cubic root of 424021781 is about 751.2700147214.

The spelling of 424021781 in words is "four hundred twenty-four million, twenty-one thousand, seven hundred eighty-one".