1398178138 has 8 divisors (see below), whose sum is σ = 2396876832. Its totient is φ = 599219196.

The previous prime is 1398178097. The next prime is 1398178157. The reversal of 1398178138 is 8318718931.

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

It is a super-2 number, since 2×1398178138² = 3909804211162294088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1398178091 and 1398178100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49934920 + ... + 49934947.

It is an arithmetic number, because the mean of its divisors is an integer number (299609604).

Almost surely, 2^1398178138 is an apocalyptic number.

1398178138 is a deficient number, since it is larger than the sum of its proper divisors (998698694).

1398178138 is an equidigital number, since it uses as much as digits as its factorization.

1398178138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99869876.

The product of its digits is 290304, while the sum is 49.

The square root of 1398178138 is about 37392.2202871132. The cubic root of 1398178138 is about 1118.2034702738.

The spelling of 1398178138 in words is "one billion, three hundred ninety-eight million, one hundred seventy-eight thousand, one hundred thirty-eight".