1523640240 has 80 divisors (see below), whose sum is σ = 5248101600. Its totient is φ = 406303488.

The previous prime is 1523640203. The next prime is 1523640253. The reversal of 1523640240 is 420463251.

1523640240 is a `hidden beast` number, since 15 + 2 + 3 + 640 + 2 + 4 + 0 = 666.

1523640240 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350535 + ... + 354854.

It is an arithmetic number, because the mean of its divisors is an integer number (65601270).

Almost surely, 2^1523640240 is an apocalyptic number.

1523640240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1523640240 is an abundant number, since it is smaller than the sum of its proper divisors (3724461360).

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

1523640240 is a wasteful number, since it uses less digits than its factorization.

1523640240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705411 (or 705399 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1523640240 is about 39033.8345541403. The cubic root of 1523640240 is about 1150.6965509212.

The spelling of 1523640240 in words is "one billion, five hundred twenty-three million, six hundred forty thousand, two hundred forty".