3978742494 has 16 divisors (see below), whose sum is σ = 7966154880. Its totient is φ = 1324802520.

The previous prime is 3978742477. The next prime is 3978742499. The reversal of 3978742494 is 4942478793.

It is a super-2 number, since 2×3978742494² = 31660783667122680072, which contains 22 as substring.

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, 355272 + ... + 366299.

It is an arithmetic number, because the mean of its divisors is an integer number (497884680).

Almost surely, 2^3978742494 is an apocalyptic number.

3978742494 is an abundant number, since it is smaller than the sum of its proper divisors (3987412386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3978742494 is a wasteful number, since it uses less digits than its factorization.

3978742494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722495.

The product of its digits is 12192768, while the sum is 57.

The square root of 3978742494 is about 63077.2739899245. The cubic root of 3978742494 is about 1584.5840402233.

The spelling of 3978742494 in words is "three billion, nine hundred seventy-eight million, seven hundred forty-two thousand, four hundred ninety-four".