124400640 has 352 divisors, whose sum is σ = 495210240. Its totient is φ = 25952256.

The previous prime is 124400621. The next prime is 124400641. The reversal of 124400640 is 46004421.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124400641) 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, 1397716 + ... + 1397804.

Almost surely, 2^124400640 is an apocalyptic number.

124400640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 124400640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247605120).

124400640 is an abundant number, since it is smaller than the sum of its proper divisors (370809600).

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

124400640 is a wasteful number, since it uses less digits than its factorization.

124400640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 124400640 is about 11153.5034854525. The cubic root of 124400640 is about 499.1995726492.

The spelling of 124400640 in words is "one hundred twenty-four million, four hundred thousand, six hundred forty".