420400434 has 16 divisors (see below), whose sum is σ = 841046400. Its totient is φ = 140092560.

The previous prime is 420400427. The next prime is 420400451. The reversal of 420400434 is 434004024.

It is a self number, because there is not a number n which added to its sum of digits gives 420400434.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18039 + ... + 34149.

It is an arithmetic number, because the mean of its divisors is an integer number (52565400).

Almost surely, 2^420400434 is an apocalyptic number.

420400434 is an abundant number, since it is smaller than the sum of its proper divisors (420645966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420400434 is a wasteful number, since it uses less digits than its factorization.

420400434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20465.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 420400434 is about 20503.6687936574. The cubic root of 420400434 is about 749.1251630550.

Adding to 420400434 its reverse (434004024), we get a palindrome (854404458).

The spelling of 420400434 in words is "four hundred twenty million, four hundred thousand, four hundred thirty-four".