1238016857 has 32 divisors (see below), whose sum is σ = 1649756160. Its totient is φ = 899354880.

The previous prime is 1238016851. The next prime is 1238016863. The reversal of 1238016857 is 7586108321.

It is an interprime number because it is at equal distance from previous prime (1238016851) and next prime (1238016863).

It is a cyclic number.

It is not a de Polignac number, because 1238016857 - 2¹⁶ = 1237951321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1238016851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135644 + ... + 144482.

It is an arithmetic number, because the mean of its divisors is an integer number (51554880).

Almost surely, 2^1238016857 is an apocalyptic number.

1238016857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1238016857 is a deficient number, since it is larger than the sum of its proper divisors (411739303).

1238016857 is a wasteful number, since it uses less digits than its factorization.

1238016857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8981.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 1238016857 is about 35185.4637172796. The cubic root of 1238016857 is about 1073.7640331228.

The spelling of 1238016857 in words is "one billion, two hundred thirty-eight million, sixteen thousand, eight hundred fifty-seven".