1961987684 has 24 divisors (see below), whose sum is σ = 3462365088. Its totient is φ = 972776000.

The previous prime is 1961987681. The next prime is 1961987689. The reversal of 1961987684 is 4867891691.

1961987684 is nontrivially palindromic in base 7.

It is not an unprimeable number, because it can be changed into a prime (1961987681) 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, 229739 + ... + 238125.

It is an arithmetic number, because the mean of its divisors is an integer number (144265212).

Almost surely, 2^1961987684 is an apocalyptic number.

It is an amenable number.

1961987684 is a deficient number, since it is larger than the sum of its proper divisors (1500377404).

1961987684 is a wasteful number, since it uses less digits than its factorization.

1961987684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8875 (or 8873 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 59.

The square root of 1961987684 is about 44294.3301563530. The cubic root of 1961987684 is about 1251.8878532926.

The spelling of 1961987684 in words is "one billion, nine hundred sixty-one million, nine hundred eighty-seven thousand, six hundred eighty-four".