1521787494940 has 24 divisors (see below), whose sum is σ = 3305952145440. Its totient is φ = 587724825408.

The previous prime is 1521787494923. The next prime is 1521787494947. The reversal of 1521787494940 is 494947871251.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521787494947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1311885192 + ... + 1311886351.

It is an arithmetic number, because the mean of its divisors is an integer number (137748006060).

Almost surely, 2^{1521787494940} is an apocalyptic number.

1521787494940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1521787494940 is an abundant number, since it is smaller than the sum of its proper divisors (1784164650500).

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

1521787494940 is a wasteful number, since it uses less digits than its factorization.

1521787494940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623771581 (or 2623771579 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 1521787494940 in words is "one trillion, five hundred twenty-one billion, seven hundred eighty-seven million, four hundred ninety-four thousand, nine hundred forty".