424007721 has 6 divisors (see below), whose sum is σ = 612455610. Its totient is φ = 282671808.

The previous prime is 424007713. The next prime is 424007777. The reversal of 424007721 is 127700424.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 254721600 + 169286121 = 15960^2 + 13011^2 .

It is not a de Polignac number, because 424007721 - 2³ = 424007713 is a prime.

It is a super-2 number, since 2×424007721² = 359565094935227682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (424007321) 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 5 ways as a sum of consecutive naturals, for example, 23555976 + ... + 23555993.

It is an arithmetic number, because the mean of its divisors is an integer number (102075935).

Almost surely, 2^424007721 is an apocalyptic number.

It is an amenable number.

424007721 is a deficient number, since it is larger than the sum of its proper divisors (188447889).

424007721 is a wasteful number, since it uses less digits than its factorization.

424007721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47111975 (or 47111972 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 424007721 is about 20591.4477635741. The cubic root of 424007721 is about 751.2617109238.

The spelling of 424007721 in words is "four hundred twenty-four million, seven thousand, seven hundred twenty-one".