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380689 = 6172
BaseRepresentation
bin1011100111100010001
3201100012121
41130330101
544140224
612054241
73143611
oct1347421
9640177
10380689
11240021
12164381
1310437a
149ca41
1577be4
hex5cf11

380689 has 3 divisors (see below), whose sum is σ = 381307. Its totient is φ = 380072.

The previous prime is 380657. The next prime is 380707. The reversal of 380689 is 986083.

The square root of 380689 is 617.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 986083 = 7140869.

It can be written as a sum of positive squares in only one way, i.e., 11025 + 369664 = 105^2 + 608^2 .

It is not a de Polignac number, because 380689 - 25 = 380657 is a prime.

It is a super-2 number, since 2×3806892 = 289848229442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (380629) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 309 + ... + 925.

2380689 is an apocalyptic number.

380689 is the 617-th square number.

380689 is the 309-th centered octagonal number.

It is an amenable number.

380689 is a deficient number, since it is larger than the sum of its proper divisors (618).

380689 is an frugal number, since it uses more digits than its factorization.

380689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234 (or 617 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The cubic root of 380689 is about 72.4753146240.

The spelling of 380689 in words is "three hundred eighty thousand, six hundred eighty-nine".

Divisors: 1 617 380689