420025281987 has 6 divisors (see below), whose sum is σ = 560035206028. Its totient is φ = 280016106304.

The previous prime is 420025281967. The next prime is 420025281997. The reversal of 420025281987 is 789182520024.

It is not a de Polignac number, because 420025281987 - 2⁷ = 420025281859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420025281947) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 935443 + ... + 1309619.

Almost surely, 2^420025281987 is an apocalyptic number.

420025281987 is a deficient number, since it is larger than the sum of its proper divisors (140009924041).

420025281987 is an frugal number, since it uses more digits than its factorization.

420025281987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748357 (or 374180 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

Multiplying 420025281987 by its sum of digits (48), we get a square (20161213535376 = 4490124²).

The spelling of 420025281987 in words is "four hundred twenty billion, twenty-five million, two hundred eighty-one thousand, nine hundred eighty-seven".