1961984907 has 24 divisors (see below), whose sum is σ = 2888155920. Its totient is φ = 1283100480.

The previous prime is 1961984851. The next prime is 1961984933. The reversal of 1961984907 is 7094891691.

1961984907 is a `hidden beast` number, since 1 + 9 + 61 + 98 + 490 + 7 = 666.

It is not a de Polignac number, because 1961984907 - 2¹¹ = 1961982859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961984107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 208968 + ... + 218154.

It is an arithmetic number, because the mean of its divisors is an integer number (120339830).

Almost surely, 2^1961984907 is an apocalyptic number.

1961984907 is a deficient number, since it is larger than the sum of its proper divisors (926171013).

1961984907 is a wasteful number, since it uses less digits than its factorization.

1961984907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9643 (or 9640 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 1961984907 is about 44294.2988092147. The cubic root of 1961984907 is about 1251.8872626511.

The spelling of 1961984907 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-four thousand, nine hundred seven".