3978742493 has 8 divisors (see below), whose sum is σ = 4490117280. Its totient is φ = 3492312880.

The previous prime is 3978742477. The next prime is 3978742499. The reversal of 3978742493 is 3942478793.

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

It is a cyclic number.

It is not a de Polignac number, because 3978742493 - 2⁴ = 3978742477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978742499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6235955 + ... + 6236592.

It is an arithmetic number, because the mean of its divisors is an integer number (561264660).

Almost surely, 2^3978742493 is an apocalyptic number.

It is an amenable number.

3978742493 is a deficient number, since it is larger than the sum of its proper divisors (511374787).

3978742493 is a wasteful number, since it uses less digits than its factorization.

3978742493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12472587.

The product of its digits is 9144576, while the sum is 56.

The square root of 3978742493 is about 63077.2739819977. The cubic root of 3978742493 is about 1584.5840400905.

The spelling of 3978742493 in words is "three billion, nine hundred seventy-eight million, seven hundred forty-two thousand, four hundred ninety-three".