123440331 has 32 divisors (see below), whose sum is σ = 194273280. Its totient is φ = 68260896.

The previous prime is 123440329. The next prime is 123440351. The reversal of 123440331 is 133044321.

It is not a de Polignac number, because 123440331 - 2¹ = 123440329 is a prime.

It is a super-2 number, since 2×123440331² = 30475030634779122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 123440298 and 123440307.

It is not an unprimeable number, because it can be changed into a prime (123440351) 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, 82270 + ... + 83756.

It is an arithmetic number, because the mean of its divisors is an integer number (6071040).

Almost surely, 2^123440331 is an apocalyptic number.

123440331 is a deficient number, since it is larger than the sum of its proper divisors (70832949).

123440331 is a wasteful number, since it uses less digits than its factorization.

123440331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 123440331 is about 11110.3704258679. The cubic root of 123440331 is about 497.9117317469.

Adding to 123440331 its reverse (133044321), we get a palindrome (256484652).

The spelling of 123440331 in words is "one hundred twenty-three million, four hundred forty thousand, three hundred thirty-one".