402129876691 has 4 divisors (see below), whose sum is σ = 402149308032. Its totient is φ = 402110445352.

The previous prime is 402129876689. The next prime is 402129876697. The reversal of 402129876691 is 196678921204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402129876691 - 2¹ = 402129876689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402129876697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9684595 + ... + 9726028.

It is an arithmetic number, because the mean of its divisors is an integer number (100537327008).

Almost surely, 2^402129876691 is an apocalyptic number.

402129876691 is a deficient number, since it is larger than the sum of its proper divisors (19431341).

402129876691 is a wasteful number, since it uses less digits than its factorization.

402129876691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19431340.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 402129876691 in words is "four hundred two billion, one hundred twenty-nine million, eight hundred seventy-six thousand, six hundred ninety-one".