1918481406 has 16 divisors (see below), whose sum is σ = 3901996800. Its totient is φ = 628654808.

The previous prime is 1918481401. The next prime is 1918481429. The reversal of 1918481406 is 6041848191.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918481401) 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, 2709366 + ... + 2710073.

It is an arithmetic number, because the mean of its divisors is an integer number (243874800).

Almost surely, 2^1918481406 is an apocalyptic number.

1918481406 is an abundant number, since it is smaller than the sum of its proper divisors (1983515394).

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

1918481406 is a wasteful number, since it uses less digits than its factorization.

1918481406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5419503.

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 1918481406 is about 43800.4726686825. The cubic root of 1918481406 is about 1242.5652336852.

The spelling of 1918481406 in words is "one billion, nine hundred eighteen million, four hundred eighty-one thousand, four hundred six".