1587142894 has 4 divisors (see below), whose sum is σ = 2380714344. Its totient is φ = 793571446.

The previous prime is 1587142873. The next prime is 1587142897. The reversal of 1587142894 is 4982417851.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1587142897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 396785722 + ... + 396785725.

It is an arithmetic number, because the mean of its divisors is an integer number (595178586).

Almost surely, 2^1587142894 is an apocalyptic number.

1587142894 is a deficient number, since it is larger than the sum of its proper divisors (793571450).

1587142894 is an equidigital number, since it uses as much as digits as its factorization.

1587142894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793571449.

The product of its digits is 645120, while the sum is 49.

The square root of 1587142894 is about 39838.9620095705. The cubic root of 1587142894 is about 1166.4657988693.

The spelling of 1587142894 in words is "one billion, five hundred eighty-seven million, one hundred forty-two thousand, eight hundred ninety-four".