402667985 has 8 divisors (see below), whose sum is σ = 485872296. Its totient is φ = 320353920.

The previous prime is 402667981. The next prime is 402668009. The reversal of 402667985 is 589766204.

It can be written as a sum of positive squares in 4 ways, for example, as 56670784 + 345997201 = 7528^2 + 18601^2 .

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

It is not a de Polignac number, because 402667985 - 2² = 402667981 is a prime.

It is a super-2 number, since 2×402667985² = 324283012287920450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402667981) 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, 221564 + ... + 223373.

It is an arithmetic number, because the mean of its divisors is an integer number (60734037).

Almost surely, 2^402667985 is an apocalyptic number.

It is an amenable number.

402667985 is a deficient number, since it is larger than the sum of its proper divisors (83204311).

402667985 is a wasteful number, since it uses less digits than its factorization.

402667985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445123.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 402667985 is about 20066.5887733815. The cubic root of 402667985 is about 738.4408278126.

The spelling of 402667985 in words is "four hundred two million, six hundred sixty-seven thousand, nine hundred eighty-five".