1921508712 has 48 divisors (see below), whose sum is σ = 5371966080. Its totient is φ = 619840800.

The previous prime is 1921508689. The next prime is 1921508717. The reversal of 1921508712 is 2178051291.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1921508717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428214 + ... + 432677.

It is an arithmetic number, because the mean of its divisors is an integer number (111915960).

Almost surely, 2^1921508712 is an apocalyptic number.

1921508712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1921508712 is an abundant number, since it is smaller than the sum of its proper divisors (3450457368).

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

1921508712 is a wasteful number, since it uses less digits than its factorization.

1921508712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860934 (or 860927 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1921508712 is about 43835.0169613290. The cubic root of 1921508712 is about 1243.2184670761.

The spelling of 1921508712 in words is "one billion, nine hundred twenty-one million, five hundred eight thousand, seven hundred twelve".