402712681 has 16 divisors (see below), whose sum is σ = 481275648. Its totient is φ = 329472000.

The previous prime is 402712663. The next prime is 402712703. The reversal of 402712681 is 186217204.

It is a cyclic number.

It is not a de Polignac number, because 402712681 - 2¹⁵ = 402679913 is a prime.

It is a super-2 number, since 2×402712681² = 324355006876415522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402712631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81481 + ... + 86281.

It is an arithmetic number, because the mean of its divisors is an integer number (30079728).

Almost surely, 2^402712681 is an apocalyptic number.

It is an amenable number.

402712681 is a deficient number, since it is larger than the sum of its proper divisors (78562967).

402712681 is a wasteful number, since it uses less digits than its factorization.

402712681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 402712681 is about 20067.7024345090. The cubic root of 402712681 is about 738.4681490230.

Adding to 402712681 its reverse (186217204), we get a palindrome (588929885).

The spelling of 402712681 in words is "four hundred two million, seven hundred twelve thousand, six hundred eighty-one".