19921383 has 16 divisors (see below), whose sum is σ = 29880800. Its totient is φ = 13279464.

The previous prime is 19921379. The next prime is 19921387. The reversal of 19921383 is 38312991.

It is an interprime number because it is at equal distance from previous prime (19921379) and next prime (19921387).

It is not a de Polignac number, because 19921383 - 2² = 19921379 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921387) 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, 2368 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (1867550).

Almost surely, 2^19921383 is an apocalyptic number.

19921383 is a deficient number, since it is larger than the sum of its proper divisors (9959417).

19921383 is an frugal number, since it uses more digits than its factorization.

19921383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130 (or 9112 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 19921383 is about 4463.3376524749. The cubic root of 19921383 is about 271.0856290001.

It can be divided in two parts, 1992 and 1383, that added together give a cube (3375 = 15³).

The spelling of 19921383 in words is "nineteen million, nine hundred twenty-one thousand, three hundred eighty-three".