1918440901 has 8 divisors (see below), whose sum is σ = 2077430264. Its totient is φ = 1761082560.

The previous prime is 1918440899. The next prime is 1918440919. The reversal of 1918440901 is 1090448191.

It can be written as a sum of positive squares in 4 ways, for example, as 187964100 + 1730476801 = 13710^2 + 41599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1918440901 - 2¹ = 1918440899 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918440001) 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, 405306 + ... + 410011.

It is an arithmetic number, because the mean of its divisors is an integer number (259678783).

Almost surely, 2^1918440901 is an apocalyptic number.

It is an amenable number.

1918440901 is a deficient number, since it is larger than the sum of its proper divisors (158989363).

1918440901 is a wasteful number, since it uses less digits than its factorization.

1918440901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815511.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1918440901 is about 43800.0102853869. The cubic root of 1918440901 is about 1242.5564888417.

The spelling of 1918440901 in words is "one billion, nine hundred eighteen million, four hundred forty thousand, nine hundred one".