398267138 has 8 divisors (see below), whose sum is σ = 597823632. Its totient is φ = 198992596.

The previous prime is 398267131. The next prime is 398267167. The reversal of 398267138 is 831762893.

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

It is a super-2 number, since 2×398267138² = 317233426421422088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 398267092 and 398267101.

It is not an unprimeable number, because it can be changed into a prime (398267131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66920 + ... + 72627.

It is an arithmetic number, because the mean of its divisors is an integer number (74727954).

Almost surely, 2^398267138 is an apocalyptic number.

398267138 is a deficient number, since it is larger than the sum of its proper divisors (199556494).

398267138 is a wasteful number, since it uses less digits than its factorization.

398267138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140976.

The product of its digits is 435456, while the sum is 47.

The square root of 398267138 is about 19956.6314291766. The cubic root of 398267138 is about 735.7407732031.

It can be divided in two parts, 39826 and 7138, that added together give a palindrome (46964).

The spelling of 398267138 in words is "three hundred ninety-eight million, two hundred sixty-seven thousand, one hundred thirty-eight".