3978794538253 has 4 divisors (see below), whose sum is σ = 3981638567200. Its totient is φ = 3975950509308.

The previous prime is 3978794538239. The next prime is 3978794538289. The reversal of 3978794538253 is 3528354978793.

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 a de Polignac number, because none of the positive numbers 2^k-3978794538253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978794508253) 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, 1422012375 + ... + 1422015172.

It is an arithmetic number, because the mean of its divisors is an integer number (995409641800).

Almost surely, 2^{3978794538253} is an apocalyptic number.

It is an amenable number.

3978794538253 is a deficient number, since it is larger than the sum of its proper divisors (2844028947).

3978794538253 is a wasteful number, since it uses less digits than its factorization.

3978794538253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844028946.

The product of its digits is 1371686400, while the sum is 73.

The spelling of 3978794538253 in words is "three trillion, nine hundred seventy-eight billion, seven hundred ninety-four million, five hundred thirty-eight thousand, two hundred fifty-three".