1649473440 has 48 divisors (see below), whose sum is σ = 5195842848. Its totient is φ = 439859456.

The previous prime is 1649473439. The next prime is 1649473499. The reversal of 1649473440 is 443749461.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1649473392 and 1649473401.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1717722 + ... + 1718681.

It is an arithmetic number, because the mean of its divisors is an integer number (108246726).

Almost surely, 2^1649473440 is an apocalyptic number.

1649473440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649473440 is an abundant number, since it is smaller than the sum of its proper divisors (3546369408).

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

1649473440 is a wasteful number, since it uses less digits than its factorization.

1649473440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3436421 (or 3436413 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 1649473440 is about 40613.7100004420. The cubic root of 1649473440 is about 1181.5400365042.

The spelling of 1649473440 in words is "one billion, six hundred forty-nine million, four hundred seventy-three thousand, four hundred forty".