1949392640 has 144 divisors (see below), whose sum is σ = 5062971648. Its totient is φ = 714866688.

The previous prime is 1949392603. The next prime is 1949392649. The reversal of 1949392640 is 462939491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949392649) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3211217 + ... + 3211823.

Almost surely, 2^1949392640 is an apocalyptic number.

1949392640 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 1949392640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2531485824).

1949392640 is an abundant number, since it is smaller than the sum of its proper divisors (3113579008).

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

1949392640 is a wasteful number, since it uses less digits than its factorization.

1949392640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 1949392640 is about 44151.9267982723. The cubic root of 1949392640 is about 1249.2032554664.

The spelling of 1949392640 in words is "one billion, nine hundred forty-nine million, three hundred ninety-two thousand, six hundred forty".