1920189915 has 64 divisors (see below), whose sum is σ = 3907537920. Its totient is φ = 876407040.

The previous prime is 1920189893. The next prime is 1920189919. The reversal of 1920189915 is 5199810291.

It is not a de Polignac number, because 1920189915 - 2¹⁵ = 1920157147 is a prime.

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 (1920189919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 808680 + ... + 811050.

It is an arithmetic number, because the mean of its divisors is an integer number (61055280).

Almost surely, 2^1920189915 is an apocalyptic number.

1920189915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1920189915 is an abundant number, since it is smaller than the sum of its proper divisors (1987348005).

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

1920189915 is a wasteful number, since it uses less digits than its factorization.

1920189915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 45.

The square root of 1920189915 is about 43819.9716453582. The cubic root of 1920189915 is about 1242.9339808958.

The spelling of 1920189915 in words is "one billion, nine hundred twenty million, one hundred eighty-nine thousand, nine hundred fifteen".