402126681 has 12 divisors (see below), whose sum is σ = 589343216. Its totient is φ = 243712920.

The previous prime is 402126679. The next prime is 402126719. The reversal of 402126681 is 186621204.

It is not a de Polignac number, because 402126681 - 2¹ = 402126679 is a prime.

It is a super-2 number, since 2×402126681² = 323411735144151522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (402126611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553531 + ... + 554256.

Almost surely, 2^402126681 is an apocalyptic number.

It is an amenable number.

402126681 is a deficient number, since it is larger than the sum of its proper divisors (187216535).

402126681 is a wasteful number, since it uses less digits than its factorization.

402126681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107812 (or 1107801 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 402126681 is about 20053.0965439256. The cubic root of 402126681 is about 738.1097856665.

Adding to 402126681 its reverse (186621204), we get a palindrome (588747885).

The spelling of 402126681 in words is "four hundred two million, one hundred twenty-six thousand, six hundred eighty-one".