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393281389 = 41107157571
BaseRepresentation
bin10111011100001…
…111111101101101
31000102000202122101
4113130033331231
51301140001024
6103005215101
712513556654
oct2734177555
91012022571
10393281389
11191aa7146
12ab861491
136362b4a7
143a33619b
15247d7c44
hex1770ff6d

393281389 has 16 divisors (see below), whose sum is σ = 409945536. Its totient is φ = 377020800.

The previous prime is 393281387. The next prime is 393281401. The reversal of 393281389 is 983182393.

It is a cyclic number.

It is not a de Polignac number, because 393281389 - 21 = 393281387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393281381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 688474 + ... + 689044.

It is an arithmetic number, because the mean of its divisors is an integer number (25621596).

Almost surely, 2393281389 is an apocalyptic number.

It is an amenable number.

393281389 is a deficient number, since it is larger than the sum of its proper divisors (16664147).

393281389 is a wasteful number, since it uses less digits than its factorization.

393281389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 279936, while the sum is 46.

The square root of 393281389 is about 19831.3234303715. The cubic root of 393281389 is about 732.6577226402.

The spelling of 393281389 in words is "three hundred ninety-three million, two hundred eighty-one thousand, three hundred eighty-nine".

Divisors: 1 41 107 157 571 4387 6437 16799 23411 61097 89647 688759 2504977 3675527 9592229 393281389