3994779253 has 4 divisors (see below), whose sum is σ = 3998421900. Its totient is φ = 3991136608.

The previous prime is 3994779223. The next prime is 3994779263. The reversal of 3994779253 is 3529774993.

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: 3529774993 = 41 ⋅86092073.

It can be written as a sum of positive squares in 2 ways, for example, as 2935797489 + 1058981764 = 54183^2 + 32542^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994779253 - 2²⁵ = 3961224821 is a prime.

It is a super-2 number, since 2×3994779253² = 31916522560398476018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994779223) 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, 1819678 + ... + 1821871.

It is an arithmetic number, because the mean of its divisors is an integer number (999605475).

Almost surely, 2^3994779253 is an apocalyptic number.

It is an amenable number.

3994779253 is a deficient number, since it is larger than the sum of its proper divisors (3642647).

3994779253 is a wasteful number, since it uses less digits than its factorization.

3994779253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642646.

The product of its digits is 12859560, while the sum is 58.

The square root of 3994779253 is about 63204.2660981045. The cubic root of 3994779253 is about 1586.7101330149.

The spelling of 3994779253 in words is "three billion, nine hundred ninety-four million, seven hundred seventy-nine thousand, two hundred fifty-three".