1987020361 has 32 divisors (see below), whose sum is σ = 2249600000. Its totient is φ = 1746800640.

The previous prime is 1987020341. The next prime is 1987020383. The reversal of 1987020361 is 1630207891.

It is a 4-Lehmer number, since φ(1987020361) divides (1987020361-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1987020361 - 2²⁵ = 1953465929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 1987020361.

It is not an unprimeable number, because it can be changed into a prime (1987020311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1590265 + ... + 1591513.

It is an arithmetic number, because the mean of its divisors is an integer number (70300000).

It is a Poulet number, since it divides 2^1987020360-1.

Almost surely, 2^1987020361 is an apocalyptic number.

It is an amenable number.

1987020361 is a deficient number, since it is larger than the sum of its proper divisors (262579639).

1987020361 is a wasteful number, since it uses less digits than its factorization.

1987020361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 1987020361 is about 44576.0065618265. The cubic root of 1987020361 is about 1257.1895790284.

The spelling of 1987020361 in words is "one billion, nine hundred eighty-seven million, twenty thousand, three hundred sixty-one".