402941721 has 64 divisors (see below), whose sum is σ = 702535680. Its totient is φ = 199480320.

The previous prime is 402941719. The next prime is 402941723. The reversal of 402941721 is 127149204.

It is an interprime number because it is at equal distance from previous prime (402941719) and next prime (402941723).

It is not a de Polignac number, because 402941721 - 2¹ = 402941719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402941723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 679201 + ... + 679793.

It is an arithmetic number, because the mean of its divisors is an integer number (10977120).

Almost surely, 2^402941721 is an apocalyptic number.

It is an amenable number.

402941721 is a deficient number, since it is larger than the sum of its proper divisors (299593959).

402941721 is a wasteful number, since it uses less digits than its factorization.

402941721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 402941721 is about 20073.4083055170. The cubic root of 402941721 is about 738.6081220091.

The spelling of 402941721 in words is "four hundred two million, nine hundred forty-one thousand, seven hundred twenty-one".