1987458923 has 4 divisors (see below), whose sum is σ = 1987553880. Its totient is φ = 1987363968.

The previous prime is 1987458883. The next prime is 1987458929. The reversal of 1987458923 is 3298547891.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1987458923 - 2²⁴ = 1970681707 is a prime.

It is a super-2 number, since 2×1987458923² = 7899985941224639858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987458929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758 + ... + 63051.

It is an arithmetic number, because the mean of its divisors is an integer number (496888470).

Almost surely, 2^1987458923 is an apocalyptic number.

1987458923 is a deficient number, since it is larger than the sum of its proper divisors (94957).

1987458923 is an equidigital number, since it uses as much as digits as its factorization.

1987458923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94956.

The product of its digits is 4354560, while the sum is 56.

The square root of 1987458923 is about 44580.9255511816. The cubic root of 1987458923 is about 1257.2820650824.

The spelling of 1987458923 in words is "one billion, nine hundred eighty-seven million, four hundred fifty-eight thousand, nine hundred twenty-three".