1618220378 has 16 divisors (see below), whose sum is σ = 2583581184. Its totient is φ = 757525440.

The previous prime is 1618220377. The next prime is 1618220393. The reversal of 1618220378 is 8730228161.

It is not an unprimeable number, because it can be changed into a prime (1618220371) 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 7 ways as a sum of consecutive naturals, for example, 118100 + ... + 131087.

It is an arithmetic number, because the mean of its divisors is an integer number (161473824).

Almost surely, 2^1618220378 is an apocalyptic number.

1618220378 is a deficient number, since it is larger than the sum of its proper divisors (965360806).

1618220378 is a wasteful number, since it uses less digits than its factorization.

1618220378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249397.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1618220378 is about 40227.1099881659. The cubic root of 1618220378 is about 1174.0300739993.

The spelling of 1618220378 in words is "one billion, six hundred eighteen million, two hundred twenty thousand, three hundred seventy-eight".