1949244173840 has 20 divisors (see below), whose sum is σ = 4531992704364. Its totient is φ = 779697669504.

The previous prime is 1949244173839. The next prime is 1949244173857. The reversal of 1949244173840 is 483714429491.

It can be written as a sum of positive squares in 2 ways, for example, as 558505118224 + 1390739055616 = 747332^2 + 1179296^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

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, 12182776007 + ... + 12182776166.

Almost surely, 2^{1949244173840} is an apocalyptic number.

1949244173840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1949244173840 is an abundant number, since it is smaller than the sum of its proper divisors (2582748530524).

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

1949244173840 is a wasteful number, since it uses less digits than its factorization.

1949244173840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24365552186 (or 24365552180 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 1949244173840 in words is "one trillion, nine hundred forty-nine billion, two hundred forty-four million, one hundred seventy-three thousand, eight hundred forty".