1338121505 has 8 divisors (see below), whose sum is σ = 1835138112. Its totient is φ = 917569008.

The previous prime is 1338121501. The next prime is 1338121583. The reversal of 1338121505 is 5051218331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1338121505 - 2² = 1338121501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338121501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19115987 + ... + 19116056.

It is an arithmetic number, because the mean of its divisors is an integer number (229392264).

Almost surely, 2^1338121505 is an apocalyptic number.

It is an amenable number.

1338121505 is a deficient number, since it is larger than the sum of its proper divisors (497016607).

1338121505 is an equidigital number, since it uses as much as digits as its factorization.

1338121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38232055.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1338121505 is about 36580.3431503861. The cubic root of 1338121505 is about 1101.9583585219.

Adding to 1338121505 its reverse (5051218331), we get a palindrome (6389339836).

The spelling of 1338121505 in words is "one billion, three hundred thirty-eight million, one hundred twenty-one thousand, five hundred five".