123431406 has 16 divisors (see below), whose sum is σ = 282129024. Its totient is φ = 35266104.

The previous prime is 123431401. The next prime is 123431431. The reversal of 123431406 is 604134321.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123431401) 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, 1469380 + ... + 1469463.

It is an arithmetic number, because the mean of its divisors is an integer number (17633064).

Almost surely, 2^123431406 is an apocalyptic number.

123431406 is an abundant number, since it is smaller than the sum of its proper divisors (158697618).

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

123431406 is a wasteful number, since it uses less digits than its factorization.

123431406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2938855.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 123431406 is about 11109.9687668328. The cubic root of 123431406 is about 497.8997314299.

Adding to 123431406 its reverse (604134321), we get a palindrome (727565727).

It can be divided in two parts, 1234 and 31406, that added together give a triangular number (32640 = T₂₅₅).

The spelling of 123431406 in words is "one hundred twenty-three million, four hundred thirty-one thousand, four hundred six".