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13669657 = 4327393
BaseRepresentation
bin110100001001…
…010100011001
3221201111020121
4310021110121
511444412112
61204553241
7224122141
oct64112431
927644217
1013669657
117797241
1246b2821
132aa7c71
141b5b921
151300407
hexd09519

13669657 has 6 divisors (see below), whose sum is σ = 13996842. Its totient is φ = 13349952.

The previous prime is 13669639. The next prime is 13669661. The reversal of 13669657 is 75696631.

It can be written as a sum of positive squares in only one way, i.e., 9585216 + 4084441 = 3096^2 + 2021^2 .

It is not a de Polignac number, because 13669657 - 27 = 13669529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13669627) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1848 + ... + 5545.

It is an arithmetic number, because the mean of its divisors is an integer number (2332807).

Almost surely, 213669657 is an apocalyptic number.

13669657 is the 1849-th decagonal number.

It is an amenable number.

13669657 is a deficient number, since it is larger than the sum of its proper divisors (327185).

13669657 is an frugal number, since it uses more digits than its factorization.

13669657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7479 (or 7436 counting only the distinct ones).

The product of its digits is 204120, while the sum is 43.

The square root of 13669657 is about 3697.2499239299. The cubic root of 13669657 is about 239.1034664612.

The spelling of 13669657 in words is "thirteen million, six hundred sixty-nine thousand, six hundred fifty-seven".

Divisors: 1 43 1849 7393 317899 13669657