1378238817 has 8 divisors (see below), whose sum is σ = 1851680160. Its totient is φ = 911811680.

The previous prime is 1378238803. The next prime is 1378238831. The reversal of 1378238817 is 7188328731.

It is an interprime number because it is at equal distance from previous prime (1378238803) and next prime (1378238831).

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 1378238817 - 2⁷ = 1378238689 is a prime.

It is a super-3 number, since 3×1378238817³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378238317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1753092 + ... + 1753877.

It is an arithmetic number, because the mean of its divisors is an integer number (231460020).

Almost surely, 2^1378238817 is an apocalyptic number.

It is an amenable number.

1378238817 is a deficient number, since it is larger than the sum of its proper divisors (473441343).

1378238817 is a wasteful number, since it uses less digits than its factorization.

1378238817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507103.

The product of its digits is 451584, while the sum is 48.

The square root of 1378238817 is about 37124.6389477393. The cubic root of 1378238817 is about 1112.8624593817.

The spelling of 1378238817 in words is "one billion, three hundred seventy-eight million, two hundred thirty-eight thousand, eight hundred seventeen".