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19912069 = 113176213
BaseRepresentation
bin100101111110…
…1010110000101
31101110122020001
41023331112011
520044141234
61550441301
7331151452
oct113752605
941418201
1019912069
1110270261
126803231
1341823b8
142904829
151b34d14
hex12fd585

19912069 has 4 divisors (see below), whose sum is σ = 20088396. Its totient is φ = 19735744.

The previous prime is 19912033. The next prime is 19912091. The reversal of 19912069 is 96021991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 18809569 = 1050^2 + 4337^2 .

It is a cyclic number.

It is not a de Polignac number, because 19912069 - 29 = 19911557 is a prime.

It is a super-2 number, since 2×199120692 = 792980983721522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19912369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87994 + ... + 88219.

It is an arithmetic number, because the mean of its divisors is an integer number (5022099).

Almost surely, 219912069 is an apocalyptic number.

It is an amenable number.

19912069 is a deficient number, since it is larger than the sum of its proper divisors (176327).

19912069 is a wasteful number, since it uses less digits than its factorization.

19912069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176326.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 19912069 is about 4462.2941409100. The cubic root of 19912069 is about 271.0433748195.

The spelling of 19912069 in words is "nineteen million, nine hundred twelve thousand, sixty-nine".

Divisors: 1 113 176213 19912069