420634123 has 16 divisors (see below), whose sum is σ = 523950336. Its totient is φ = 328793760.

The previous prime is 420634121. The next prime is 420634139. The reversal of 420634123 is 321436024.

It is a cyclic number.

It is not a de Polignac number, because 420634123 - 2¹ = 420634121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (420634121) 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 15 ways as a sum of consecutive naturals, for example, 20293 + ... + 35398.

It is an arithmetic number, because the mean of its divisors is an integer number (32746896).

Almost surely, 2^420634123 is an apocalyptic number.

420634123 is a deficient number, since it is larger than the sum of its proper divisors (103316213).

420634123 is a wasteful number, since it uses less digits than its factorization.

420634123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55794.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 420634123 is about 20509.3667137725. The cubic root of 420634123 is about 749.2639433453.

It can be divided in two parts, 420 and 634123, that multiplied together give a triangular number (266331660 = T₂₃₀₇₉).

The spelling of 420634123 in words is "four hundred twenty million, six hundred thirty-four thousand, one hundred twenty-three".