1631444140 has 24 divisors (see below), whose sum is σ = 3426892560. Its totient is φ = 652413888.

The previous prime is 1631444057. The next prime is 1631444173. The reversal of 1631444140 is 414441361.

It is a junction number, because it is equal to n+sod(n) for n = 1631444099 and 1631444108.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 100854 + ... + 115906.

It is an arithmetic number, because the mean of its divisors is an integer number (142787190).

Almost surely, 2^1631444140 is an apocalyptic number.

1631444140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1631444140 is an abundant number, since it is smaller than the sum of its proper divisors (1795448420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1631444140 is a wasteful number, since it uses less digits than its factorization.

1631444140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20481 (or 20479 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1631444140 is about 40391.1393748678. The cubic root of 1631444140 is about 1177.2193791877.

The spelling of 1631444140 in words is "one billion, six hundred thirty-one million, four hundred forty-four thousand, one hundred forty".