19913641 has 8 divisors (see below), whose sum is σ = 21797568. Its totient is φ = 18042000.

The previous prime is 19913629. The next prime is 19913671. The reversal of 19913641 is 14631991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19913641 - 2¹³ = 19905449 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19913597 and 19913606.

It is not an unprimeable number, because it can be changed into a prime (19913671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511 + ... + 6331.

It is an arithmetic number, because the mean of its divisors is an integer number (2724696).

Almost surely, 2^19913641 is an apocalyptic number.

19913641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19913641 is a deficient number, since it is larger than the sum of its proper divisors (1883927).

19913641 is a wasteful number, since it uses less digits than its factorization.

19913641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6143.

The product of its digits is 5832, while the sum is 34.

The square root of 19913641 is about 4462.4702800131. The cubic root of 19913641 is about 271.0505073275.

The spelling of 19913641 in words is "nineteen million, nine hundred thirteen thousand, six hundred forty-one".