1928239990 has 16 divisors (see below), whose sum is σ = 3582794880. Its totient is φ = 746415360.

The previous prime is 1928239987. The next prime is 1928240009. The reversal of 1928239990 is 999328291.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3109755 + ... + 3110374.

It is an arithmetic number, because the mean of its divisors is an integer number (223924680).

Almost surely, 2^1928239990 is an apocalyptic number.

1928239990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1928239990 is a deficient number, since it is larger than the sum of its proper divisors (1654554890).

1928239990 is a wasteful number, since it uses less digits than its factorization.

1928239990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6220167.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 1928239990 is about 43911.7295264033. The cubic root of 1928239990 is about 1244.6684901995.

The spelling of 1928239990 in words is "one billion, nine hundred twenty-eight million, two hundred thirty-nine thousand, nine hundred ninety".