3921436778 has 24 divisors (see below), whose sum is σ = 6868569312. Its totient is φ = 1674214584.

The previous prime is 3921436777. The next prime is 3921436787. The reversal of 3921436778 is 8776341293.

3921436778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3921436777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50300 + ... + 101847.

It is an arithmetic number, because the mean of its divisors is an integer number (286190388).

Almost surely, 2^3921436778 is an apocalyptic number.

3921436778 is a deficient number, since it is larger than the sum of its proper divisors (2947132534).

3921436778 is a wasteful number, since it uses less digits than its factorization.

3921436778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152426 (or 152419 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 50.

The square root of 3921436778 is about 62621.3763662218. The cubic root of 3921436778 is about 1576.9396481589.

The spelling of 3921436778 in words is "three billion, nine hundred twenty-one million, four hundred thirty-six thousand, seven hundred seventy-eight".