1898400608444 has 12 divisors (see below), whose sum is σ = 3328577653968. Its totient is φ = 947378421600.

The previous prime is 1898400608411. The next prime is 1898400608453. The reversal of 1898400608444 is 4448060048981.

It is a super-2 number, since 2×1898400608444² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1898400608444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455468312 + ... + 455472479.

It is an arithmetic number, because the mean of its divisors is an integer number (277381471164).

Almost surely, 2^{1898400608444} is an apocalyptic number.

It is an amenable number.

1898400608444 is a deficient number, since it is larger than the sum of its proper divisors (1430177045524).

1898400608444 is a wasteful number, since it uses less digits than its factorization.

1898400608444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910941316 (or 910941314 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 56.

The spelling of 1898400608444 in words is "one trillion, eight hundred ninety-eight billion, four hundred million, six hundred eight thousand, four hundred forty-four".