1949657920 has 112 divisors (see below), whose sum is σ = 5618073600. Its totient is φ = 629121024.

The previous prime is 1949657917. The next prime is 1949657959. The reversal of 1949657920 is 297569491.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12481 + ... + 63679.

Almost surely, 2^1949657920 is an apocalyptic number.

1949657920 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 1949657920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2809036800).

1949657920 is an abundant number, since it is smaller than the sum of its proper divisors (3668415680).

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

1949657920 is a wasteful number, since it uses less digits than its factorization.

1949657920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51240 (or 51230 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 52.

The square root of 1949657920 is about 44154.9308684772. The cubic root of 1949657920 is about 1249.2599181763.

The spelling of 1949657920 in words is "one billion, nine hundred forty-nine million, six hundred fifty-seven thousand, nine hundred twenty".