1244519640 has 672 divisors, whose sum is σ = 5337949680. Its totient is φ = 258660864.

The previous prime is 1244519587. The next prime is 1244519641. The reversal of 1244519640 is 469154421.

1244519640 is a `hidden beast` number, since 1 + 2 + 4 + 4 + 5 + 1 + 9 + 640 = 666.

1244519640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 = 1244519595 and 1244519604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244519641) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 18574887 + ... + 18574953.

Almost surely, 2^1244519640 is an apocalyptic number.

1244519640 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 1244519640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2668974840).

1244519640 is an abundant number, since it is smaller than the sum of its proper divisors (4093430040).

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

1244519640 is a wasteful number, since it uses less digits than its factorization.

1244519640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1244519640 is about 35277.7499282480. The cubic root of 1244519640 is about 1075.6407616747.

The spelling of 1244519640 in words is "one billion, two hundred forty-four million, five hundred nineteen thousand, six hundred forty".