1638234087 has 64 divisors (see below), whose sum is σ = 2781609984. Its totient is φ = 835591680.

The previous prime is 1638234071. The next prime is 1638234097. The reversal of 1638234087 is 7804328361.

It is not a de Polignac number, because 1638234087 - 2⁴ = 1638234071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638234097) 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 63 ways as a sum of consecutive naturals, for example, 1042012 + ... + 1043582.

It is an arithmetic number, because the mean of its divisors is an integer number (43462656).

Almost surely, 2^1638234087 is an apocalyptic number.

1638234087 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1638234087 is a deficient number, since it is larger than the sum of its proper divisors (1143375897).

1638234087 is a wasteful number, since it uses less digits than its factorization.

1638234087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 1638234087 is about 40475.1045335278. The cubic root of 1638234087 is about 1178.8502846853.

It can be divided in two parts, 163823 and 4087, that added together give a triangular number (167910 = T₅₇₉).

The spelling of 1638234087 in words is "one billion, six hundred thirty-eight million, two hundred thirty-four thousand, eighty-seven".