1919390920 has 16 divisors (see below), whose sum is σ = 4318629660. Its totient is φ = 767756352.

The previous prime is 1919390881. The next prime is 1919390923. The reversal of 1919390920 is 290939191.

It can be written as a sum of positive squares in 2 ways, for example, as 1733723044 + 185667876 = 41638^2 + 13626^2 .

It is not an unprimeable number, because it can be changed into a prime (1919390923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23992347 + ... + 23992426.

Almost surely, 2^1919390920 is an apocalyptic number.

1919390920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1919390920 is an abundant number, since it is smaller than the sum of its proper divisors (2399238740).

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

1919390920 is a wasteful number, since it uses less digits than its factorization.

1919390920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47984784 (or 47984780 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 1919390920 is about 43810.8539063096. The cubic root of 1919390920 is about 1242.7615611778.

The spelling of 1919390920 in words is "one billion, nine hundred nineteen million, three hundred ninety thousand, nine hundred twenty".