123920440 has 32 divisors (see below), whose sum is σ = 318653280. Its totient is φ = 42486912.

The previous prime is 123920417. The next prime is 123920443. The reversal of 123920440 is 44029321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123920443) 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, 221007 + ... + 221566.

It is an arithmetic number, because the mean of its divisors is an integer number (9957915).

Almost surely, 2^123920440 is an apocalyptic number.

123920440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123920440 is an abundant number, since it is smaller than the sum of its proper divisors (194732840).

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

123920440 is a wasteful number, since it uses less digits than its factorization.

123920440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442591 (or 442587 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 123920440 is about 11131.9558030025. The cubic root of 123920440 is about 498.5564228477.

Adding to 123920440 its reverse (44029321), we get a palindrome (167949761).

The spelling of 123920440 in words is "one hundred twenty-three million, nine hundred twenty thousand, four hundred forty".