1949191440 has 320 divisors, whose sum is σ = 7379527680. Its totient is φ = 415457280.

The previous prime is 1949191421. The next prime is 1949191463. The reversal of 1949191440 is 441919491.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1949191392 and 1949191401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3969595 + ... + 3970085.

It is an arithmetic number, because the mean of its divisors is an integer number (23061024).

Almost surely, 2^1949191440 is an apocalyptic number.

1949191440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1949191440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3689763840).

1949191440 is an abundant number, since it is smaller than the sum of its proper divisors (5430336240).

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

1949191440 is a wasteful number, since it uses less digits than its factorization.

1949191440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1949191440 is about 44149.6482432193. The cubic root of 1949191440 is about 1249.1602765513.

The spelling of 1949191440 in words is "one billion, nine hundred forty-nine million, one hundred ninety-one thousand, four hundred forty".