1964190987 has 24 divisors (see below), whose sum is σ = 3257991360. Its totient is φ = 1127764080.

The previous prime is 1964190979. The next prime is 1964190989. The reversal of 1964190987 is 7890914691.

It is not a de Polignac number, because 1964190987 - 2³ = 1964190979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1964190989) 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, 520233 + ... + 523994.

It is an arithmetic number, because the mean of its divisors is an integer number (135749640).

Almost surely, 2^1964190987 is an apocalyptic number.

1964190987 is a deficient number, since it is larger than the sum of its proper divisors (1293800373).

1964190987 is a wasteful number, since it uses less digits than its factorization.

1964190987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044263 (or 1044260 counting only the distinct ones).

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

The square root of 1964190987 is about 44319.1943406015. The cubic root of 1964190987 is about 1252.3562993850.

The spelling of 1964190987 in words is "one billion, nine hundred sixty-four million, one hundred ninety thousand, nine hundred eighty-seven".