123431402 has 8 divisors (see below), whose sum is σ = 189663012. Its totient is φ = 60210400.

The previous prime is 123431401. The next prime is 123431431. The reversal of 123431402 is 204134321.

It can be written as a sum of positive squares in 2 ways, for example, as 83375161 + 40056241 = 9131^2 + 6329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (123431401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752549 + ... + 752712.

Almost surely, 2^123431402 is an apocalyptic number.

123431402 is a deficient number, since it is larger than the sum of its proper divisors (66231610).

123431402 is a wasteful number, since it uses less digits than its factorization.

123431402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505304.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123431402 is about 11109.9685868143. The cubic root of 123431402 is about 497.8997260515.

Adding to 123431402 its reverse (204134321), we get a palindrome (327565723).

The spelling of 123431402 in words is "one hundred twenty-three million, four hundred thirty-one thousand, four hundred two".