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19930381 is a prime number
BaseRepresentation
bin100110000000…
…1110100001101
31101111120100021
41030001310031
520100233011
61551102141
7331256032
oct114016415
941446307
1019930381
1110282a99
126811951
13418a833
14290b389
151b3a471
hex1301d0d

19930381 has 2 divisors, whose sum is σ = 19930382. Its totient is φ = 19930380.

The previous prime is 19930333. The next prime is 19930399. The reversal of 19930381 is 18303991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10530025 + 9400356 = 3245^2 + 3066^2 .

It is a cyclic number.

It is not a de Polignac number, because 19930381 - 211 = 19928333 is a prime.

It is a super-2 number, since 2×199303812 = 794440173610322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19930301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9965190 + 9965191.

It is an arithmetic number, because the mean of its divisors is an integer number (9965191).

Almost surely, 219930381 is an apocalyptic number.

19930381 is the 2824-th centered pentagonal number.

It is an amenable number.

19930381 is a deficient number, since it is larger than the sum of its proper divisors (1).

19930381 is an equidigital number, since it uses as much as digits as its factorization.

19930381 is an evil number, because the sum of its binary digits is even.

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

The square root of 19930381 is about 4464.3455287421. The cubic root of 19930381 is about 271.1264370996.

The spelling of 19930381 in words is "nineteen million, nine hundred thirty thousand, three hundred eighty-one".