402405216687 has 12 divisors (see below), whose sum is σ = 593619043680. Its totient is φ = 262562268768.

The previous prime is 402405216667. The next prime is 402405216721. The reversal of 402405216687 is 786612504204.

402405216687 is a `hidden beast` number, since 4 + 0 + 2 + 40 + 521 + 6 + 6 + 87 = 666.

It is not a de Polignac number, because 402405216687 - 2¹² = 402405212591 is a prime.

It is a super-2 number, since 2×402405216687² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402405216667) 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, 475655862 + ... + 475656707.

It is an arithmetic number, because the mean of its divisors is an integer number (49468253640).

Almost surely, 2^402405216687 is an apocalyptic number.

402405216687 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

402405216687 is a deficient number, since it is larger than the sum of its proper divisors (191213826993).

402405216687 is a wasteful number, since it uses less digits than its factorization.

402405216687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951312622 (or 951312619 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 402405216687 in words is "four hundred two billion, four hundred five million, two hundred sixteen thousand, six hundred eighty-seven".