19921293 has 36 divisors (see below), whose sum is σ = 33789600. Its totient is φ = 11276496.

The previous prime is 19921261. The next prime is 19921303. The reversal of 19921293 is 39212991.

It is a happy number.

It is not a de Polignac number, because 19921293 - 2⁵ = 19921261 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19920293) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87646 + ... + 87872.

It is an arithmetic number, because the mean of its divisors is an integer number (938600).

Almost surely, 2^19921293 is an apocalyptic number.

It is an amenable number.

19921293 is a deficient number, since it is larger than the sum of its proper divisors (13868307).

19921293 is a wasteful number, since it uses less digits than its factorization.

19921293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 436 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 19921293 is about 4463.3275703224. The cubic root of 19921293 is about 271.0852207663.

The spelling of 19921293 in words is "nineteen million, nine hundred twenty-one thousand, two hundred ninety-three".