123478563 has 32 divisors (see below), whose sum is σ = 182407680. Its totient is φ = 73831680.

The previous prime is 123478561. The next prime is 123478601. The reversal of 123478563 is 365874321.

It is not a de Polignac number, because 123478563 - 2¹ = 123478561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (123478561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 236743 + ... + 237263.

It is an arithmetic number, because the mean of its divisors is an integer number (5700240).

Almost surely, 2^123478563 is an apocalyptic number.

123478563 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

123478563 is a deficient number, since it is larger than the sum of its proper divisors (58929117).

123478563 is a wasteful number, since it uses less digits than its factorization.

123478563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699.

The product of its digits is 120960, while the sum is 39.

The square root of 123478563 is about 11112.0908473608. The cubic root of 123478563 is about 497.9631309296.

It can be divided in two parts, 12347 and 8563, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 123478563 in words is "one hundred twenty-three million, four hundred seventy-eight thousand, five hundred sixty-three".