402680 has 16 divisors (see below), whose sum is σ = 906120. Its totient is φ = 161056.

The previous prime is 402631. The next prime is 402691. The reversal of 402680 is 86204.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

402680 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4994 + ... + 5073.

2⁴⁰²⁶⁸⁰ is an apocalyptic number.

402680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402680 is an abundant number, since it is smaller than the sum of its proper divisors (503440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402680 is a wasteful number, since it uses less digits than its factorization.

402680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10078 (or 10074 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 402680 is about 634.5707210390. The cubic root of 402680 is about 73.8448172390.

Adding to 402680 its reverse (86204), we get a palindrome (488884).

The spelling of 402680 in words is "four hundred two thousand, six hundred eighty".