1645614040 has 48 divisors (see below), whose sum is σ = 4307148000. Its totient is φ = 564209856.

The previous prime is 1645614031. The next prime is 1645614043. The reversal of 1645614040 is 404165461.

It is a junction number, because it is equal to n+sod(n) for n = 1645613993 and 1645614011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645614043) 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 11 ways as a sum of consecutive naturals, for example, 417840 + ... + 421759.

It is an arithmetic number, because the mean of its divisors is an integer number (89732250).

Almost surely, 2^1645614040 is an apocalyptic number.

1645614040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645614040 is an abundant number, since it is smaller than the sum of its proper divisors (2661533960).

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

1645614040 is a wasteful number, since it uses less digits than its factorization.

1645614040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839624 (or 839613 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1645614040 is about 40566.1686630621. The cubic root of 1645614040 is about 1180.6178034600.

The spelling of 1645614040 in words is "one billion, six hundred forty-five million, six hundred fourteen thousand, forty".