1331404878 has 16 divisors (see below), whose sum is σ = 2819445840. Its totient is φ = 417695616.

The previous prime is 1331404873. The next prime is 1331404897. The reversal of 1331404878 is 8784041331.

1331404878 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331404871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6526393 + ... + 6526596.

It is an arithmetic number, because the mean of its divisors is an integer number (176215365).

Almost surely, 2^1331404878 is an apocalyptic number.

1331404878 is an abundant number, since it is smaller than the sum of its proper divisors (1488040962).

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

1331404878 is a wasteful number, since it uses less digits than its factorization.

1331404878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13053011.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1331404878 is about 36488.4211497291. The cubic root of 1331404878 is about 1100.1115253316. Note that the first 3 decimals are identical.

The spelling of 1331404878 in words is "one billion, three hundred thirty-one million, four hundred four thousand, eight hundred seventy-eight".