420890997 has 8 divisors (see below), whose sum is σ = 561348256. Its totient is φ = 280513872.

The previous prime is 420890971. The next prime is 420891041. The reversal of 420890997 is 799098024.

It is a happy number.

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

It is not a de Polignac number, because 420890997 - 2⁶ = 420890933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420890927) 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, 6463 + ... + 29724.

It is an arithmetic number, because the mean of its divisors is an integer number (70168532).

Almost surely, 2^420890997 is an apocalyptic number.

It is an amenable number.

420890997 is a deficient number, since it is larger than the sum of its proper divisors (140457259).

420890997 is a wasteful number, since it uses less digits than its factorization.

420890997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40067.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 420890997 is about 20515.6281161460. The cubic root of 420890997 is about 749.4164331619.

The spelling of 420890997 in words is "four hundred twenty million, eight hundred ninety thousand, nine hundred ninety-seven".