1241399520 has 336 divisors, whose sum is σ = 4561220160. Its totient is φ = 318753792.

The previous prime is 1241399519. The next prime is 1241399521. The reversal of 1241399520 is 259931421.

1241399520 is a `hidden beast` number, since 1 + 2 + 41 + 3 + 99 + 520 = 666.

It is an interprime number because it is at equal distance from previous prime (1241399519) and next prime (1241399521).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1241399521) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3382377 + ... + 3382743.

It is an arithmetic number, because the mean of its divisors is an integer number (13575060).

Almost surely, 2^1241399520 is an apocalyptic number.

1241399520 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 1241399520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280610080).

1241399520 is an abundant number, since it is smaller than the sum of its proper divisors (3319820640).

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

1241399520 is an equidigital number, since it uses as much as digits as its factorization.

1241399520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1241399520 is about 35233.4999680702. The cubic root of 1241399520 is about 1074.7411008039.

The spelling of 1241399520 in words is "one billion, two hundred forty-one million, three hundred ninety-nine thousand, five hundred twenty".