1645155240 has 32 divisors (see below), whose sum is σ = 4935466080. Its totient is φ = 438708032.

The previous prime is 1645155227. The next prime is 1645155257. The reversal of 1645155240 is 425515461.

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 7 ways as a sum of consecutive naturals, for example, 6854694 + ... + 6854933.

It is an arithmetic number, because the mean of its divisors is an integer number (154233315).

Almost surely, 2^1645155240 is an apocalyptic number.

1645155240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645155240 is an abundant number, since it is smaller than the sum of its proper divisors (3290310840).

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

1645155240 is a wasteful number, since it uses less digits than its factorization.

1645155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13709641 (or 13709637 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 1645155240 is about 40560.5133103613. The cubic root of 1645155240 is about 1180.5080738429.

The spelling of 1645155240 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, two hundred forty".