1997138 has 16 divisors (see below), whose sum is σ = 3519936. Its totient is φ = 837840.

The previous prime is 1997137. The next prime is 1997141. The reversal of 1997138 is 8317991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3206 + ... + 3777.

It is an arithmetic number, because the mean of its divisors is an integer number (219996).

2^1997138 is an apocalyptic number.

1997138 is a deficient number, since it is larger than the sum of its proper divisors (1522798).

1997138 is a wasteful number, since it uses less digits than its factorization.

1997138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7009.

The product of its digits is 13608, while the sum is 38.

The square root of 1997138 is about 1413.2013303136. The cubic root of 1997138 is about 125.9319780657.

It can be divided in two parts, 199 and 7138, that added together give a palindrome (7337).

The spelling of 1997138 in words is "one million, nine hundred ninety-seven thousand, one hundred thirty-eight".