Search a number
-
+
19730911 = 1931139241
BaseRepresentation
bin100101101000…
…1000111011111
31101010102201111
41023101013133
520022342121
61542522451
7326465344
oct113210737
941112644
1019730911
1110157142
126736427
13411aac5
1428987cb
151aeb2e1
hex12d11df

19730911 has 16 divisors (see below), whose sum is σ = 21683200. Its totient is φ = 17884800.

The previous prime is 19730899. The next prime is 19730917. The reversal of 19730911 is 11903791.

It is a cyclic number.

It is not a de Polignac number, because 19730911 - 219 = 19206623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19730917) 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, 81751 + ... + 81991.

It is an arithmetic number, because the mean of its divisors is an integer number (1355200).

Almost surely, 219730911 is an apocalyptic number.

19730911 is the 1987-th centered decagonal number.

19730911 is a deficient number, since it is larger than the sum of its proper divisors (1952289).

19730911 is a wasteful number, since it uses less digits than its factorization.

19730911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its (nonzero) digits is 1701, while the sum is 31.

The square root of 19730911 is about 4441.9490091625. The cubic root of 19730911 is about 270.2188942780.

The spelling of 19730911 in words is "nineteen million, seven hundred thirty thousand, nine hundred eleven".

Divisors: 1 19 31 139 241 589 2641 4309 4579 7471 33499 81871 141949 636481 1038469 19730911