123992640 has 224 divisors, whose sum is σ = 444764160. Its totient is φ = 32514048.

The previous prime is 123992639. The next prime is 123992641. The reversal of 123992640 is 46299321.

123992640 is a `hidden beast` number, since 1 + 2 + 3 + 9 + 9 + 2 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (123992639) and next prime (123992641).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123992595 and 123992604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123992641) 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, 976257 + ... + 976383.

Almost surely, 2^123992640 is an apocalyptic number.

123992640 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 123992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222382080).

123992640 is an abundant number, since it is smaller than the sum of its proper divisors (320771520).

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

123992640 is a wasteful number, since it uses less digits than its factorization.

123992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 123992640 is about 11135.1982470004. The cubic root of 123992640 is about 498.6532290061.

The spelling of 123992640 in words is "one hundred twenty-three million, nine hundred ninety-two thousand, six hundred forty".