1987697353 has 4 divisors (see below), whose sum is σ = 1987845760. Its totient is φ = 1987548948.

The previous prime is 1987697347. The next prime is 1987697419. The reversal of 1987697353 is 3537967891.

It is a happy number.

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 1987697353 - 2⁵ = 1987697321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987697333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51873 + ... + 81646.

It is an arithmetic number, because the mean of its divisors is an integer number (496961440).

Almost surely, 2^1987697353 is an apocalyptic number.

It is an amenable number.

1987697353 is a deficient number, since it is larger than the sum of its proper divisors (148407).

1987697353 is a wasteful number, since it uses less digits than its factorization.

1987697353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148406.

The product of its digits is 8573040, while the sum is 58.

The square root of 1987697353 is about 44583.5995967127. The cubic root of 1987697353 is about 1257.3323406332.

The spelling of 1987697353 in words is "one billion, nine hundred eighty-seven million, six hundred ninety-seven thousand, three hundred fifty-three".