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38449681 = 40994009
BaseRepresentation
bin1001001010101…
…1001000010001
32200100110001021
42102223020101
534320342211
63452035441
7644550124
oct222531021
980313037
1038449681
111a7818a6
1210a62b81
137c72cba
14516c3bb
153597771
hex24ab211

38449681 has 4 divisors (see below), whose sum is σ = 38544100. Its totient is φ = 38355264.

The previous prime is 38449669. The next prime is 38449687. The reversal of 38449681 is 18694483.

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 15563025 + 22886656 = 3945^2 + 4784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-38449681 is a prime.

It is a super-2 number, since 2×384496812 = 2956755938003522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38449687) 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, 46596 + ... + 47413.

It is an arithmetic number, because the mean of its divisors is an integer number (9636025).

Almost surely, 238449681 is an apocalyptic number.

It is an amenable number.

38449681 is a deficient number, since it is larger than the sum of its proper divisors (94419).

38449681 is an equidigital number, since it uses as much as digits as its factorization.

38449681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94418.

The product of its digits is 165888, while the sum is 43.

The square root of 38449681 is about 6200.7806766568. The cubic root of 38449681 is about 337.5184984831.

The spelling of 38449681 in words is "thirty-eight million, four hundred forty-nine thousand, six hundred eighty-one".

Divisors: 1 409 94009 38449681