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1984969809 = 32148512
BaseRepresentation
bin111011001010000…
…0011110001010001
312010100001220200100
41312110003301101
513031123013214
6524544443013
7100121651664
oct16624036121
95110056610
101984969809
11929511219
12474919469
13258314064
1414b8a56db
15b93e4309
hex76503c51

1984969809 has 9 divisors (see below), whose sum is σ = 2867371689. Its totient is φ = 1323224100.

The previous prime is 1984969769. The next prime is 1984969837. The reversal of 1984969809 is 9089694891.

The square root of 1984969809 is 44553.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1984969809 - 219 = 1984445521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1984969009) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 126234 + ... + 141084.

Almost surely, 21984969809 is an apocalyptic number.

1984969809 is the 44553-rd square number.

1984969809 is the 22277-th centered octagonal number.

It is an amenable number.

1984969809 is a deficient number, since it is larger than the sum of its proper divisors (882401880).

1984969809 is an frugal number, since it uses more digits than its factorization.

1984969809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29708 (or 14854 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The cubic root of 1984969809 is about 1256.7569681451.

The spelling of 1984969809 in words is "one billion, nine hundred eighty-four million, nine hundred sixty-nine thousand, eight hundred nine".

Divisors: 1 3 9 14851 44553 133659 220552201 661656603 1984969809