19991652 has 48 divisors (see below), whose sum is σ = 48996864. Its totient is φ = 6336000.

The previous prime is 19991651. The next prime is 19991717. The reversal of 19991652 is 25619991.

It is a happy number.

It is a super-2 number, since 2×19991652² = 799332299378208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19991651) 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, 22252 + ... + 23132.

It is an arithmetic number, because the mean of its divisors is an integer number (1020768).

Almost surely, 2^19991652 is an apocalyptic number.

19991652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19991652 is an abundant number, since it is smaller than the sum of its proper divisors (29005212).

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

19991652 is a wasteful number, since it uses less digits than its factorization.

19991652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 978 counting only the distinct ones).

The product of its digits is 43740, while the sum is 42.

The square root of 19991652 is about 4471.2025228120. The cubic root of 19991652 is about 271.4039898066.

The spelling of 19991652 in words is "nineteen million, nine hundred ninety-one thousand, six hundred fifty-two".