1798138 has 4 divisors (see below), whose sum is σ = 2697210. Its totient is φ = 899068.

The previous prime is 1798133. The next prime is 1798151. The reversal of 1798138 is 8318971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1580049 + 218089 = 1257^2 + 467^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1798097 and 1798106.

It is not an unprimeable number, because it can be changed into a prime (1798133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449533 + ... + 449536.

2^1798138 is an apocalyptic number.

1798138 is a deficient number, since it is larger than the sum of its proper divisors (899072).

1798138 is an equidigital number, since it uses as much as digits as its factorization.

1798138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899071.

The product of its digits is 12096, while the sum is 37.

The square root of 1798138 is about 1340.9466805209. The cubic root of 1798138 is about 121.6020807729.

It can be divided in two parts, 1798 and 138, that added together give a square (1936 = 44²).

The spelling of 1798138 in words is "one million, seven hundred ninety-eight thousand, one hundred thirty-eight".