402440665 has 8 divisors (see below), whose sum is σ = 526831488. Its totient is φ = 292684080.

The previous prime is 402440663. The next prime is 402440737. The reversal of 402440665 is 566044204.

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

It is not a de Polignac number, because 402440665 - 2¹ = 402440663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402440663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3658497 + ... + 3658606.

It is an arithmetic number, because the mean of its divisors is an integer number (65853936).

Almost surely, 2^402440665 is an apocalyptic number.

It is an amenable number.

402440665 is a deficient number, since it is larger than the sum of its proper divisors (124390823).

402440665 is a wasteful number, since it uses less digits than its factorization.

402440665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317119.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 402440665 is about 20060.9238321669. The cubic root of 402440665 is about 738.3018431957.

Adding to 402440665 its reverse (566044204), we get a palindrome (968484869).

The spelling of 402440665 in words is "four hundred two million, four hundred forty thousand, six hundred sixty-five".