3997401 has 4 divisors (see below), whose sum is σ = 5329872. Its totient is φ = 2664932.

The previous prime is 3997381. The next prime is 3997403. The reversal of 3997401 is 1047993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1047993 = 3 ⋅349331.

It is a cyclic number.

It is not a de Polignac number, because 3997401 - 2¹⁴ = 3981017 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3997403) 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, 666231 + ... + 666236.

It is an arithmetic number, because the mean of its divisors is an integer number (1332468).

Almost surely, 2^3997401 is an apocalyptic number.

3997401 is the 1265-th centered pentagonal number.

It is an amenable number.

3997401 is a deficient number, since it is larger than the sum of its proper divisors (1332471).

3997401 is a wasteful number, since it uses less digits than its factorization.

3997401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332470.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 3997401 is about 1999.3501444219. The cubic root of 3997401 is about 158.7057172868.

The spelling of 3997401 in words is "three million, nine hundred ninety-seven thousand, four hundred one".