123315440 has 40 divisors (see below), whose sum is σ = 287847648. Its totient is φ = 49130240.

The previous prime is 123315403. The next prime is 123315449. The reversal of 123315440 is 44513321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-4 number, since 4×123315440⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123315449) 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, 18110 + ... + 23970.

Almost surely, 2^123315440 is an apocalyptic number.

123315440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123315440 is an abundant number, since it is smaller than the sum of its proper divisors (164532208).

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

123315440 is a wasteful number, since it uses less digits than its factorization.

123315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6137 (or 6131 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 123315440 is about 11104.7485338480. The cubic root of 123315440 is about 497.7437540225.

Adding to 123315440 its reverse (44513321), we get a palindrome (167828761).

It can be divided in two parts, 12331 and 5440, that added together give a palindrome (17771).

The spelling of 123315440 in words is "one hundred twenty-three million, three hundred fifteen thousand, four hundred forty".