1338724857 has 16 divisors (see below), whose sum is σ = 1989437760. Its totient is φ = 795773952.

The previous prime is 1338724853. The next prime is 1338724859. The reversal of 1338724857 is 7584278331.

It is not a de Polignac number, because 1338724857 - 2² = 1338724853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1338724853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689808 + ... + 691745.

It is an arithmetic number, because the mean of its divisors is an integer number (124339860).

Almost surely, 2^1338724857 is an apocalyptic number.

1338724857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1338724857 is a deficient number, since it is larger than the sum of its proper divisors (650712903).

1338724857 is a wasteful number, since it uses less digits than its factorization.

1338724857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381592.

The product of its digits is 1128960, while the sum is 48.

The square root of 1338724857 is about 36588.5891638363. The cubic root of 1338724857 is about 1102.1239560588.

The spelling of 1338724857 in words is "one billion, three hundred thirty-eight million, seven hundred twenty-four thousand, eight hundred fifty-seven".