1987452757 has 4 divisors (see below), whose sum is σ = 1996131820. Its totient is φ = 1978773696.

The previous prime is 1987452721. The next prime is 1987452799. The reversal of 1987452757 is 7572547891.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1322122321 + 665330436 = 36361^2 + 25794^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987452757 - 2¹¹ = 1987450709 is a prime.

It is a super-2 number, since 2×1987452757² = 7899936922613802098, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1987452698 and 1987452707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987452707) 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, 4339188 + ... + 4339645.

It is an arithmetic number, because the mean of its divisors is an integer number (499032955).

Almost surely, 2^1987452757 is an apocalyptic number.

It is an amenable number.

1987452757 is a deficient number, since it is larger than the sum of its proper divisors (8679063).

1987452757 is an equidigital number, since it uses as much as digits as its factorization.

1987452757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8679062.

The product of its digits is 4939200, while the sum is 55.

The square root of 1987452757 is about 44580.8563959913. The cubic root of 1987452757 is about 1257.2807648611.

The spelling of 1987452757 in words is "one billion, nine hundred eighty-seven million, four hundred fifty-two thousand, seven hundred fifty-seven".