3979993 has 4 divisors (see below), whose sum is σ = 4077108. Its totient is φ = 3882880.

The previous prime is 3979981. The next prime is 3979999. The reversal of 3979993 is 3999793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3999793 = 7 ⋅571399.

It can be written as a sum of positive squares in 2 ways, for example, as 1827904 + 2152089 = 1352^2 + 1467^2 .

It is a cyclic number.

It is not a de Polignac number, because 3979993 - 2¹⁷ = 3848921 is a prime.

It is a super-3 number, since 3×3979993³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

3979993 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3979999) 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, 48496 + ... + 48577.

It is an arithmetic number, because the mean of its divisors is an integer number (1019277).

Almost surely, 2^3979993 is an apocalyptic number.

It is an amenable number.

3979993 is a deficient number, since it is larger than the sum of its proper divisors (97115).

3979993 is an equidigital number, since it uses as much as digits as its factorization.

3979993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97114.

The product of its digits is 413343, while the sum is 49.

The square root of 3979993 is about 1994.9919799338. The cubic root of 3979993 is about 158.4750032727.

The spelling of 3979993 in words is "three million, nine hundred seventy-nine thousand, nine hundred ninety-three".