1920528987 has 16 divisors (see below), whose sum is σ = 2902824960. Its totient is φ = 1119660192.

The previous prime is 1920528979. The next prime is 1920528989. The reversal of 1920528987 is 7898250291.

It is not a de Polignac number, because 1920528987 - 2³ = 1920528979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1920528989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1295163 + ... + 1296644.

It is an arithmetic number, because the mean of its divisors is an integer number (181426560).

Almost surely, 2^1920528987 is an apocalyptic number.

1920528987 is a deficient number, since it is larger than the sum of its proper divisors (982295973).

1920528987 is a wasteful number, since it uses less digits than its factorization.

1920528987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591842.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1920528987 is about 43823.8403953830. The cubic root of 1920528987 is about 1243.0071367338.

The spelling of 1920528987 in words is "one billion, nine hundred twenty million, five hundred twenty-eight thousand, nine hundred eighty-seven".