3997155 has 8 divisors (see below), whose sum is σ = 6395472. Its totient is φ = 2131808.

The previous prime is 3997141. The next prime is 3997181. The reversal of 3997155 is 5517993.

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

It is a cyclic number.

It is not a de Polignac number, because 3997155 - 2¹⁰ = 3996131 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133224 + ... + 133253.

It is an arithmetic number, because the mean of its divisors is an integer number (799434).

Almost surely, 2^3997155 is an apocalyptic number.

3997155 is a deficient number, since it is larger than the sum of its proper divisors (2398317).

3997155 is a wasteful number, since it uses less digits than its factorization.

3997155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266485.

The product of its digits is 42525, while the sum is 39.

The square root of 3997155 is about 1999.2886234859. The cubic root of 3997155 is about 158.7024616375.

The spelling of 3997155 in words is "three million, nine hundred ninety-seven thousand, one hundred fifty-five".