1643040354 has 16 divisors (see below), whose sum is σ = 3286478592. Its totient is φ = 547613808.

The previous prime is 1643040353. The next prime is 1643040367. The reversal of 1643040354 is 4530403461.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1643040353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84712 + ... + 102284.

It is an arithmetic number, because the mean of its divisors is an integer number (205404912).

Almost surely, 2^1643040354 is an apocalyptic number.

1643040354 is an abundant number, since it is smaller than the sum of its proper divisors (1643438238).

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

1643040354 is a wasteful number, since it uses less digits than its factorization.

1643040354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33161.

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1643040354 is about 40534.4341763888. The cubic root of 1643040354 is about 1180.0019999009.

The spelling of 1643040354 in words is "one billion, six hundred forty-three million, forty thousand, three hundred fifty-four".