420043987 has 8 divisors (see below), whose sum is σ = 465742512. Its totient is φ = 375597600.

The previous prime is 420043957. The next prime is 420044003. The reversal of 420043987 is 789340024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420043987 is a prime.

It is a super-3 number, since 3×420043987³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420043907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312328 + ... + 313669.

It is an arithmetic number, because the mean of its divisors is an integer number (58217814).

Almost surely, 2^420043987 is an apocalyptic number.

420043987 is a deficient number, since it is larger than the sum of its proper divisors (45698525).

420043987 is a wasteful number, since it uses less digits than its factorization.

420043987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626069.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 420043987 is about 20494.9746767348. The cubic root of 420043987 is about 748.9133817005.

The spelling of 420043987 in words is "four hundred twenty million, forty-three thousand, nine hundred eighty-seven".