420510891 has 8 divisors (see below), whose sum is σ = 560810304. Its totient is φ = 280276040.

The previous prime is 420510847. The next prime is 420510901. The reversal of 420510891 is 198015024.

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 not a de Polignac number, because 420510891 - 2⁷ = 420510763 is a prime.

It is a super-2 number, since 2×420510891² = 353658818899227762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (420510821) 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, 1960 + ... + 29066.

It is an arithmetic number, because the mean of its divisors is an integer number (70101288).

Almost surely, 2^420510891 is an apocalyptic number.

420510891 is a deficient number, since it is larger than the sum of its proper divisors (140299413).

420510891 is a wasteful number, since it uses less digits than its factorization.

420510891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32281.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 420510891 is about 20506.3622078612. The cubic root of 420510891 is about 749.1907662795.

The spelling of 420510891 in words is "four hundred twenty million, five hundred ten thousand, eight hundred ninety-one".