1987182421 has 32 divisors (see below), whose sum is σ = 2404552448. Its totient is φ = 1606832640.

The previous prime is 1987182409. The next prime is 1987182437. The reversal of 1987182421 is 1242817891.

It is not a de Polignac number, because 1987182421 - 2¹¹ = 1987180373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987182401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1152466 + ... + 1154188.

It is an arithmetic number, because the mean of its divisors is an integer number (75142264).

Almost surely, 2^1987182421 is an apocalyptic number.

It is an amenable number.

1987182421 is a deficient number, since it is larger than the sum of its proper divisors (417370027).

1987182421 is a wasteful number, since it uses less digits than its factorization.

1987182421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its digits is 64512, while the sum is 43.

The square root of 1987182421 is about 44577.8243188247. The cubic root of 1987182421 is about 1257.2237566021.

The spelling of 1987182421 in words is "one billion, nine hundred eighty-seven million, one hundred eighty-two thousand, four hundred twenty-one".