1938949728 has 48 divisors (see below), whose sum is σ = 5146953840. Its totient is φ = 639051776.

The previous prime is 1938949723. The next prime is 1938949729. The reversal of 1938949728 is 8279498391.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1938949728² = 7519052095422547968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938949723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104925 + ... + 122012.

It is an arithmetic number, because the mean of its divisors is an integer number (107228205).

Almost surely, 2^1938949728 is an apocalyptic number.

It is an amenable number.

1938949728 is an abundant number, since it is smaller than the sum of its proper divisors (3208004112).

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

1938949728 is a wasteful number, since it uses less digits than its factorization.

1938949728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227039 (or 227031 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 60.

The square root of 1938949728 is about 44033.5068782853. The cubic root of 1938949728 is about 1246.9685963898.

The spelling of 1938949728 in words is "one billion, nine hundred thirty-eight million, nine hundred forty-nine thousand, seven hundred twenty-eight".