3978903 has 4 divisors (see below), whose sum is σ = 5305208. Its totient is φ = 2652600.

The previous prime is 3978899. The next prime is 3978917. The reversal of 3978903 is 3098793.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3978903 - 2² = 3978899 is a prime.

It is a D-number.

It is a Duffinian number.

3978903 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978803) 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, 663148 + ... + 663153.

It is an arithmetic number, because the mean of its divisors is an integer number (1326302).

Almost surely, 2^3978903 is an apocalyptic number.

3978903 is a deficient number, since it is larger than the sum of its proper divisors (1326305).

3978903 is a wasteful number, since it uses less digits than its factorization.

3978903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326304.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 3978903 is about 1994.7187771714. The cubic root of 3978903 is about 158.4605347778.

The spelling of 3978903 in words is "three million, nine hundred seventy-eight thousand, nine hundred three".