1987227653 has 4 divisors (see below), whose sum is σ = 1987484268. Its totient is φ = 1986971040.

The previous prime is 1987227611. The next prime is 1987227659. The reversal of 1987227653 is 3567227891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3567227891 = 1097 ⋅3251803.

It can be written as a sum of positive squares in 2 ways, for example, as 534626884 + 1452600769 = 23122^2 + 38113^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987227653 - 2⁶ = 1987227589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987227659) 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, 116318 + ... + 132303.

It is an arithmetic number, because the mean of its divisors is an integer number (496871067).

Almost surely, 2^1987227653 is an apocalyptic number.

It is an amenable number.

1987227653 is a deficient number, since it is larger than the sum of its proper divisors (256615).

1987227653 is an equidigital number, since it uses as much as digits as its factorization.

1987227653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256614.

The product of its digits is 1270080, while the sum is 50.

The square root of 1987227653 is about 44578.3316533941. The cubic root of 1987227653 is about 1257.2332954535.

The spelling of 1987227653 in words is "one billion, nine hundred eighty-seven million, two hundred twenty-seven thousand, six hundred fifty-three".