402761665 has 8 divisors (see below), whose sum is σ = 483462720. Its totient is φ = 322110192.

The previous prime is 402761663. The next prime is 402761669. The reversal of 402761665 is 566167204.

It is a happy number.

402761665 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402761665 - 2¹ = 402761663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402761663) 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 7 ways as a sum of consecutive naturals, for example, 8766 + ... + 29704.

It is an arithmetic number, because the mean of its divisors is an integer number (60432840).

Almost surely, 2^402761665 is an apocalyptic number.

It is an amenable number.

402761665 is a deficient number, since it is larger than the sum of its proper divisors (80701055).

402761665 is a wasteful number, since it uses less digits than its factorization.

402761665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24791.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 402761665 is about 20068.9228659637. The cubic root of 402761665 is about 738.4980890265.

The spelling of 402761665 in words is "four hundred two million, seven hundred sixty-one thousand, six hundred sixty-five".