1398278016 has 96 divisors (see below), whose sum is σ = 4260438000. Its totient is φ = 438669312.

The previous prime is 1398277997. The next prime is 1398278017. The reversal of 1398278016 is 6108728931.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398278017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16116 + ... + 55283.

Almost surely, 2^1398278016 is an apocalyptic number.

1398278016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1398278016 is an abundant number, since it is smaller than the sum of its proper divisors (2862159984).

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

1398278016 is a wasteful number, since it uses less digits than its factorization.

1398278016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71436 (or 71421 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1398278016 is about 37393.5558084545. Note that the first 3 decimals coincide. The cubic root of 1398278016 is about 1118.2300957001.

The spelling of 1398278016 in words is "one billion, three hundred ninety-eight million, two hundred seventy-eight thousand, sixteen".