421078987 has 16 divisors (see below), whose sum is σ = 490365952. Its totient is φ = 354119040.

The previous prime is 421078951. The next prime is 421078991. The reversal of 421078987 is 789870124.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421078987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421078937) 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, 125443 + ... + 128755.

It is an arithmetic number, because the mean of its divisors is an integer number (30647872).

Almost surely, 2^421078987 is an apocalyptic number.

421078987 is a deficient number, since it is larger than the sum of its proper divisors (69286965).

421078987 is a wasteful number, since it uses less digits than its factorization.

421078987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3658.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 421078987 is about 20520.2092338261. The cubic root of 421078987 is about 749.5279915990.

The spelling of 421078987 in words is "four hundred twenty-one million, seventy-eight thousand, nine hundred eighty-seven".