3978393 has 8 divisors (see below), whose sum is σ = 5383968. Its totient is φ = 2612544.

The previous prime is 3978349. The next prime is 3978421. The reversal of 3978393 is 3938793.

It is a happy number.

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

It is not a de Polignac number, because 3978393 - 2⁶ = 3978329 is a prime.

It is a super-2 number, since 2×3978393² = 31655221724898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3978593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9696 + ... + 10097.

It is an arithmetic number, because the mean of its divisors is an integer number (672996).

Almost surely, 2^3978393 is an apocalyptic number.

It is an amenable number.

3978393 is a deficient number, since it is larger than the sum of its proper divisors (1405575).

3978393 is a wasteful number, since it uses less digits than its factorization.

3978393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19863.

The product of its digits is 122472, while the sum is 42.

The square root of 3978393 is about 1994.5909355053. The cubic root of 3978393 is about 158.4537642077.

It can be divided in two parts, 3978 and 393, that added together give a triangular number (4371 = T₉₃).

The spelling of 3978393 in words is "three million, nine hundred seventy-eight thousand, three hundred ninety-three".