3948781915 has 8 divisors (see below), whose sum is σ = 5103041328. Its totient is φ = 2916023520.

The previous prime is 3948781909. The next prime is 3948781927. The reversal of 3948781915 is 5191878493.

It is a happy number.

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

It is not a de Polignac number, because 3948781915 - 2¹³ = 3948773723 is a prime.

It is a super-2 number, since 2×3948781915² = 31185757224462134450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 30375181 + ... + 30375310.

It is an arithmetic number, because the mean of its divisors is an integer number (637880166).

Almost surely, 2^3948781915 is an apocalyptic number.

3948781915 is a deficient number, since it is larger than the sum of its proper divisors (1154259413).

3948781915 is a wasteful number, since it uses less digits than its factorization.

3948781915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60750509.

The product of its digits is 2177280, while the sum is 55.

The square root of 3948781915 is about 62839.3341387383. The cubic root of 3948781915 is about 1580.5966228092.

The spelling of 3948781915 in words is "three billion, nine hundred forty-eight million, seven hundred eighty-one thousand, nine hundred fifteen".