1981402118 has 16 divisors (see below), whose sum is σ = 3129477120. Its totient is φ = 938274696.

The previous prime is 1981402069. The next prime is 1981402127. The reversal of 1981402118 is 8112041891.

It is a super-3 number, since 3×1981402118³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173171 + ... + 184257.

It is an arithmetic number, because the mean of its divisors is an integer number (195592320).

Almost surely, 2^1981402118 is an apocalyptic number.

1981402118 is a deficient number, since it is larger than the sum of its proper divisors (1148075002).

1981402118 is a wasteful number, since it uses less digits than its factorization.

1981402118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15811.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1981402118 is about 44512.9432637295. The cubic root of 1981402118 is about 1256.0035713822.

The spelling of 1981402118 in words is "one billion, nine hundred eighty-one million, four hundred two thousand, one hundred eighteen".