16401378 has 24 divisors (see below), whose sum is σ = 38158992. Its totient is φ = 4686024.

The previous prime is 16401377. The next prime is 16401391. The reversal of 16401378 is 87310461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (16401373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27600 + ... + 28187.

It is an arithmetic number, because the mean of its divisors is an integer number (1589958).

Almost surely, 2^16401378 is an apocalyptic number.

16401378 is an abundant number, since it is smaller than the sum of its proper divisors (21757614).

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

16401378 is a wasteful number, since it uses less digits than its factorization.

16401378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55806 (or 55799 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 16401378 is about 4049.8614791126. The cubic root of 16401378 is about 254.0739342917.

The spelling of 16401378 in words is "sixteen million, four hundred one thousand, three hundred seventy-eight".