3997139 has 4 divisors (see below), whose sum is σ = 4033920. Its totient is φ = 3960360.

The previous prime is 3997129. The next prime is 3997141. The reversal of 3997139 is 9317993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9317993 = 421 ⋅22133.

It is a cyclic number.

It is not a de Polignac number, because 3997139 - 2¹² = 3993043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3997096 and 3997105.

It is not an unprimeable number, because it can be changed into a prime (3997129) 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, 18227 + ... + 18444.

It is an arithmetic number, because the mean of its divisors is an integer number (1008480).

Almost surely, 2^3997139 is an apocalyptic number.

3997139 is a deficient number, since it is larger than the sum of its proper divisors (36781).

3997139 is a wasteful number, since it uses less digits than its factorization.

3997139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36780.

The product of its digits is 45927, while the sum is 41.

The square root of 3997139 is about 1999.2846220586. The cubic root of 3997139 is about 158.7022498833.

The spelling of 3997139 in words is "three million, nine hundred ninety-seven thousand, one hundred thirty-nine".