19629940 has 24 divisors (see below), whose sum is σ = 44970912. Its totient is φ = 7138080.

The previous prime is 19629901. The next prime is 19629941. The reversal of 19629940 is 4992691.

It is a super-4 number, since 4×19629940⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19629893 and 19629902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19629941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44394 + ... + 44833.

It is an arithmetic number, because the mean of its divisors is an integer number (1873788).

Almost surely, 2^19629940 is an apocalyptic number.

19629940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19629940 is an abundant number, since it is smaller than the sum of its proper divisors (25340972).

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

19629940 is a wasteful number, since it uses less digits than its factorization.

19629940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89247 (or 89245 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 19629940 is about 4430.5688122407. The cubic root of 19629940 is about 269.7571662096.

The spelling of 19629940 in words is "nineteen million, six hundred twenty-nine thousand, nine hundred forty".