1648438940 has 12 divisors (see below), whose sum is σ = 3461721816. Its totient is φ = 659375568.

The previous prime is 1648438933. The next prime is 1648438973. The reversal of 1648438940 is 498348461.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 41210954 + ... + 41210993.

It is an arithmetic number, because the mean of its divisors is an integer number (288476818).

Almost surely, 2^1648438940 is an apocalyptic number.

1648438940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648438940 is an abundant number, since it is smaller than the sum of its proper divisors (1813282876).

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

1648438940 is a wasteful number, since it uses less digits than its factorization.

1648438940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82421956 (or 82421954 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 1648438940 is about 40600.9721558487. The cubic root of 1648438940 is about 1181.2929760873.

The spelling of 1648438940 in words is "one billion, six hundred forty-eight million, four hundred thirty-eight thousand, nine hundred forty".