1986961648 has 40 divisors (see below), whose sum is σ = 4465384832. Its totient is φ = 838842048.

The previous prime is 1986961643. The next prime is 1986961661. The reversal of 1986961648 is 8461696891.

It is a junction number, because it is equal to n+sod(n) for n = 1986961592 and 1986961601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1986961643) 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, 124890 + ... + 139897.

Almost surely, 2^1986961648 is an apocalyptic number.

It is an amenable number.

1986961648 is an abundant number, since it is smaller than the sum of its proper divisors (2478423184).

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

1986961648 is a wasteful number, since it uses less digits than its factorization.

1986961648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264869 (or 264863 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 58.

The square root of 1986961648 is about 44575.3479851812. The cubic root of 1986961648 is about 1257.1771963170.

The spelling of 1986961648 in words is "one billion, nine hundred eighty-six million, nine hundred sixty-one thousand, six hundred forty-eight".