421336687 has 16 divisors (see below), whose sum is σ = 452088000. Its totient is φ = 391288320.

The previous prime is 421336673. The next prime is 421336691. The reversal of 421336687 is 786633124.

It is a de Polignac number, because none of the positive numbers 2^k-421336687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421336187) 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, 458014 + ... + 458932.

It is an arithmetic number, because the mean of its divisors is an integer number (28255500).

Almost surely, 2^421336687 is an apocalyptic number.

421336687 is a deficient number, since it is larger than the sum of its proper divisors (30751313).

421336687 is a wasteful number, since it uses less digits than its factorization.

421336687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266.

The product of its digits is 145152, while the sum is 40.

The square root of 421336687 is about 20526.4874491473. The cubic root of 421336687 is about 749.6808639259.

The spelling of 421336687 in words is "four hundred twenty-one million, three hundred thirty-six thousand, six hundred eighty-seven".