1649825540 has 24 divisors (see below), whose sum is σ = 3779600832. Its totient is φ = 599936480.

The previous prime is 1649825531. The next prime is 1649825543. The reversal of 1649825540 is 455289461.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1649825491 and 1649825500.

It is not an unprimeable number, because it can be changed into a prime (1649825543) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3749384 + ... + 3749823.

It is an arithmetic number, because the mean of its divisors is an integer number (157483368).

Almost surely, 2^1649825540 is an apocalyptic number.

1649825540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649825540 is an abundant number, since it is smaller than the sum of its proper divisors (2129775292).

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

1649825540 is a wasteful number, since it uses less digits than its factorization.

1649825540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7499227 (or 7499225 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 1649825540 is about 40618.0445122608. The cubic root of 1649825540 is about 1181.6241018467.

The spelling of 1649825540 in words is "one billion, six hundred forty-nine million, eight hundred twenty-five thousand, five hundred forty".