1928169540 has 72 divisors (see below), whose sum is σ = 6380494848. Its totient is φ = 467434560.

The previous prime is 1928169539. The next prime is 1928169541. The reversal of 1928169540 is 459618291.

1928169540 is a `hidden beast` number, since 1 + 92 + 8 + 16 + 9 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (1928169539) and next prime (1928169541).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1928169541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 484932 + ... + 488891.

It is an arithmetic number, because the mean of its divisors is an integer number (88617984).

Almost surely, 2^1928169540 is an apocalyptic number.

1928169540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1928169540 is an abundant number, since it is smaller than the sum of its proper divisors (4452325308).

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

1928169540 is a wasteful number, since it uses less digits than its factorization.

1928169540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973849 (or 973844 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1928169540 is about 43910.9273416083. The cubic root of 1928169540 is about 1244.6533316502.

The spelling of 1928169540 in words is "one billion, nine hundred twenty-eight million, one hundred sixty-nine thousand, five hundred forty".