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13238690 = 251323869
BaseRepresentation
bin110010100000…
…000110100010
3220220121001212
4302200012202
511342114230
61151430122
7220345523
oct62400642
926817055
1013238690
117522473
124525342
132986a5a
141a8884a
151267895
hexca01a2

13238690 has 8 divisors (see below), whose sum is σ = 23829660. Its totient is φ = 5295472.

The previous prime is 13238689. The next prime is 13238717. The reversal of 13238690 is 9683231.

It can be written as a sum of positive squares in 2 ways, for example, as 12159169 + 1079521 = 3487^2 + 1039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×132386902 = 350525825832200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661925 + ... + 661944.

Almost surely, 213238690 is an apocalyptic number.

13238690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13238690 is a deficient number, since it is larger than the sum of its proper divisors (10590970).

13238690 is a wasteful number, since it uses less digits than its factorization.

13238690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323876.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 13238690 is about 3638.5010649992. The cubic root of 13238690 is about 236.5638271260.

The spelling of 13238690 in words is "thirteen million, two hundred thirty-eight thousand, six hundred ninety".

Divisors: 1 2 5 10 1323869 2647738 6619345 13238690