1920388428 has 72 divisors (see below), whose sum is σ = 5676839168. Its totient is φ = 535919328.

The previous prime is 1920388423. The next prime is 1920388451. The reversal of 1920388428 is 8248830291.

1920388428 is a `hidden beast` number, since 19 + 203 + 8 + 8 + 428 = 666.

It is a super-2 number, since 2×1920388428² = 7375783428792622368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1920388423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77776 + ... + 99447.

Almost surely, 2^1920388428 is an apocalyptic number.

1920388428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1920388428 is an abundant number, since it is smaller than the sum of its proper divisors (3756450740).

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

1920388428 is a wasteful number, since it uses less digits than its factorization.

1920388428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177283 (or 177278 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1920388428 is about 43822.2366841310. The cubic root of 1920388428 is about 1242.9768117376.

The spelling of 1920388428 in words is "one billion, nine hundred twenty million, three hundred eighty-eight thousand, four hundred twenty-eight".