420599987 has 4 divisors (see below), whose sum is σ = 424530936. Its totient is φ = 416669040.

The previous prime is 420599981. The next prime is 420599999. The reversal of 420599987 is 789995024.

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 420599987 - 2⁶ = 420599923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420599981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1965314 + ... + 1965527.

It is an arithmetic number, because the mean of its divisors is an integer number (106132734).

Almost surely, 2^420599987 is an apocalyptic number.

420599987 is a deficient number, since it is larger than the sum of its proper divisors (3930949).

420599987 is a wasteful number, since it uses less digits than its factorization.

420599987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930948.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 420599987 is about 20508.5344917671. The cubic root of 420599987 is about 749.2436742924.

The spelling of 420599987 in words is "four hundred twenty million, five hundred ninety-nine thousand, nine hundred eighty-seven".