3997138 has 4 divisors (see below), whose sum is σ = 5995710. Its totient is φ = 1998568.

The previous prime is 3997129. The next prime is 3997141. The reversal of 3997138 is 8317993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8317993 = 1873 ⋅4441.

It can be written as a sum of positive squares in only one way, i.e., 3697929 + 299209 = 1923^2 + 547^2 .

It is a super-2 number, since 2×3997138² = 31954224382088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3997138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999283 + ... + 999286.

Almost surely, 2^3997138 is an apocalyptic number.

3997138 is a deficient number, since it is larger than the sum of its proper divisors (1998572).

3997138 is a wasteful number, since it uses less digits than its factorization.

3997138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998571.

The product of its digits is 40824, while the sum is 40.

The square root of 3997138 is about 1999.2843719691. The cubic root of 3997138 is about 158.7022366486.

The spelling of 3997138 in words is "three million, nine hundred ninety-seven thousand, one hundred thirty-eight".