1561986460 has 24 divisors (see below), whose sum is σ = 3385984896. Its totient is φ = 604639680.

The previous prime is 1561986427. The next prime is 1561986463. The reversal of 1561986460 is 646891651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561986460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561986463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1259047 + ... + 1260286.

It is an arithmetic number, because the mean of its divisors is an integer number (141082704).

Almost surely, 2^1561986460 is an apocalyptic number.

1561986460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561986460 is an abundant number, since it is smaller than the sum of its proper divisors (1823998436).

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

1561986460 is a wasteful number, since it uses less digits than its factorization.

1561986460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519373 (or 2519371 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 1561986460 is about 39521.9743940001. The cubic root of 1561986460 is about 1160.2700669249.

The spelling of 1561986460 in words is "one billion, five hundred sixty-one million, nine hundred eighty-six thousand, four hundred sixty".