3978997 has 4 divisors (see below), whose sum is σ = 4340736. Its totient is φ = 3617260.

The previous prime is 3978979. The next prime is 3979013. The reversal of 3978997 is 7998793.

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.

It is a cyclic number.

It is not a de Polignac number, because 3978997 - 2¹¹ = 3976949 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978917) 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, 180853 + ... + 180874.

It is an arithmetic number, because the mean of its divisors is an integer number (1085184).

Almost surely, 2^3978997 is an apocalyptic number.

It is an amenable number.

3978997 is a deficient number, since it is larger than the sum of its proper divisors (361739).

3978997 is a wasteful number, since it uses less digits than its factorization.

3978997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361738.

The product of its digits is 857304, while the sum is 52.

The square root of 3978997 is about 1994.7423392509. The cubic root of 3978997 is about 158.4617826237.

The spelling of 3978997 in words is "three million, nine hundred seventy-eight thousand, nine hundred ninety-seven".