1939454928 has 140 divisors (see below), whose sum is σ = 5965983108. Its totient is φ = 608394240.

The previous prime is 1939454927. The next prime is 1939454947. The reversal of 1939454928 is 8294549391.

1939454928 is a `hidden beast` number, since 1 + 9 + 3 + 94 + 549 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1186940304 + 752514624 = 34452^2 + 27432^2 .

It is a super-2 number, since 2×1939454928² = 7522970835486970368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1939454927) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 193398 + ... + 203178.

Almost surely, 2^1939454928 is an apocalyptic number.

1939454928 is a gapful number since it is divisible by the number (18) 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 1939454928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2982991554).

1939454928 is an abundant number, since it is smaller than the sum of its proper divisors (4026528180).

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

1939454928 is an equidigital number, since it uses as much as digits as its factorization.

1939454928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9824 (or 9803 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 1939454928 is about 44039.2430452659. The cubic root of 1939454928 is about 1247.0768876330.

The spelling of 1939454928 in words is "one billion, nine hundred thirty-nine million, four hundred fifty-four thousand, nine hundred twenty-eight".