1987457473 has 4 divisors (see below), whose sum is σ = 1987580848. Its totient is φ = 1987334100.

The previous prime is 1987457419. The next prime is 1987457477. The reversal of 1987457473 is 3747547891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1987457473 - 2²⁹ = 1450586561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987457477) 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, 33111 + ... + 71212.

It is an arithmetic number, because the mean of its divisors is an integer number (496895212).

Almost surely, 2^1987457473 is an apocalyptic number.

It is an amenable number.

1987457473 is a deficient number, since it is larger than the sum of its proper divisors (123375).

1987457473 is a wasteful number, since it uses less digits than its factorization.

1987457473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123374.

The product of its digits is 5927040, while the sum is 55.

The square root of 1987457473 is about 44580.9092886181. The cubic root of 1987457473 is about 1257.2817593219.

The spelling of 1987457473 in words is "one billion, nine hundred eighty-seven million, four hundred fifty-seven thousand, four hundred seventy-three".