1929689420 has 48 divisors (see below), whose sum is σ = 4236115968. Its totient is φ = 736992960.

The previous prime is 1929689417. The next prime is 1929689423. The reversal of 1929689420 is 249869291.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1929689417) and next prime (1929689423).

It is not an unprimeable number, because it can be changed into a prime (1929689423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275765 + ... + 282675.

It is an arithmetic number, because the mean of its divisors is an integer number (88252416).

Almost surely, 2^1929689420 is an apocalyptic number.

1929689420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1929689420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2118057984).

1929689420 is an abundant number, since it is smaller than the sum of its proper divisors (2306426548).

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

1929689420 is a wasteful number, since it uses less digits than its factorization.

1929689420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7550 (or 7548 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 1929689420 is about 43928.2303308476. The cubic root of 1929689420 is about 1244.9802785003.

The spelling of 1929689420 in words is "one billion, nine hundred twenty-nine million, six hundred eighty-nine thousand, four hundred twenty".