1638630154 has 32 divisors (see below), whose sum is σ = 2881105920. Its totient is φ = 684340272.

The previous prime is 1638630143. The next prime is 1638630163. The reversal of 1638630154 is 4510368361.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275787 + ... + 281665.

It is an arithmetic number, because the mean of its divisors is an integer number (90034560).

Almost surely, 2^1638630154 is an apocalyptic number.

1638630154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1638630154 is a deficient number, since it is larger than the sum of its proper divisors (1242475766).

1638630154 is a wasteful number, since it uses less digits than its factorization.

1638630154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6394.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1638630154 is about 40479.9969614623. The cubic root of 1638630154 is about 1178.9452784507.

The spelling of 1638630154 in words is "one billion, six hundred thirty-eight million, six hundred thirty thousand, one hundred fifty-four".