1338641645 has 32 divisors (see below), whose sum is σ = 1791313920. Its totient is φ = 952128000.

The previous prime is 1338641641. The next prime is 1338641657. The reversal of 1338641645 is 5461468331.

It is not a de Polignac number, because 1338641645 - 2² = 1338641641 is a prime.

It is a super-3 number, since 3×1338641645³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1338641641) 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 31 ways as a sum of consecutive naturals, for example, 639761 + ... + 641849.

It is an arithmetic number, because the mean of its divisors is an integer number (55978560).

Almost surely, 2^1338641645 is an apocalyptic number.

It is an amenable number.

1338641645 is a deficient number, since it is larger than the sum of its proper divisors (452672275).

1338641645 is a wasteful number, since it uses less digits than its factorization.

1338641645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357.

The product of its digits is 207360, while the sum is 41.

The square root of 1338641645 is about 36587.4520156843. The cubic root of 1338641645 is about 1102.1011204382.

The spelling of 1338641645 in words is "one billion, three hundred thirty-eight million, six hundred forty-one thousand, six hundred forty-five".