420390001 has 8 divisors (see below), whose sum is σ = 425090600. Its totient is φ = 415704960.

The previous prime is 420389993. The next prime is 420390013. The reversal of 420390001 is 100093024.

It can be written as a sum of positive squares in 4 ways, for example, as 99980001 + 320410000 = 9999^2 + 17900^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 420390001 - 2³ = 420389993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420390301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55405 + ... + 62533.

It is an arithmetic number, because the mean of its divisors is an integer number (53136325).

Almost surely, 2^420390001 is an apocalyptic number.

It is an amenable number.

420390001 is a deficient number, since it is larger than the sum of its proper divisors (4700599).

420390001 is a wasteful number, since it uses less digits than its factorization.

420390001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7779.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 420390001 is about 20503.4143741963. The cubic root of 420390001 is about 749.1189660367.

The spelling of 420390001 in words is "four hundred twenty million, three hundred ninety thousand, one".