3915978250 has 64 divisors (see below), whose sum is σ = 7557488640. Its totient is φ = 1518264000.

The previous prime is 3915978239. The next prime is 3915978251. The reversal of 3915978250 is 528795193.

It is a junction number, because it is equal to n+sod(n) for n = 3915978194 and 3915978203.

It is not an unprimeable number, because it can be changed into a prime (3915978251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3061111 + ... + 3062389.

It is an arithmetic number, because the mean of its divisors is an integer number (118085760).

Almost surely, 2^3915978250 is an apocalyptic number.

3915978250 is a deficient number, since it is larger than the sum of its proper divisors (3641510390).

3915978250 is a wasteful number, since it uses less digits than its factorization.

3915978250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 49.

The square root of 3915978250 is about 62577.7776051531. Note that the first 3 decimals coincide. The cubic root of 3915978250 is about 1576.2076234168.

The spelling of 3915978250 in words is "three billion, nine hundred fifteen million, nine hundred seventy-eight thousand, two hundred fifty".