123929440 has 48 divisors (see below), whose sum is σ = 299608848. Its totient is φ = 48416256.

The previous prime is 123929411. The next prime is 123929461. The reversal of 123929440 is 44929321.

It is a junction number, because it is equal to n+sod(n) for n = 123929396 and 123929405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127 + ... + 15886.

It is an arithmetic number, because the mean of its divisors is an integer number (6241851).

Almost surely, 2^123929440 is an apocalyptic number.

123929440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123929440 is an abundant number, since it is smaller than the sum of its proper divisors (175679408).

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

123929440 is a wasteful number, since it uses less digits than its factorization.

123929440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18071 (or 18063 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 123929440 is about 11132.3600372967. The cubic root of 123929440 is about 498.5684921485.

The spelling of 123929440 in words is "one hundred twenty-three million, nine hundred twenty-nine thousand, four hundred forty".