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690889 is a prime number
BaseRepresentation
bin10101000101011001001
31022002201111
42220223021
5134102024
622450321
75605153
oct2505311
91262644
10690889
11432091
122939a1
131b2614
1413dad3
15d9a94
hexa8ac9

690889 has 2 divisors, whose sum is σ = 690890. Its totient is φ = 690888.

The previous prime is 690887. The next prime is 690919. The reversal of 690889 is 988096.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 652864 + 38025 = 808^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 690889 - 21 = 690887 is a prime.

It is a super-2 number, since 2×6908892 = 954655220642, which contains 22 as substring.

Together with 690887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (690887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345444 + 345445.

It is an arithmetic number, because the mean of its divisors is an integer number (345445).

2690889 is an apocalyptic number.

It is an amenable number.

690889 is a deficient number, since it is larger than the sum of its proper divisors (1).

690889 is an equidigital number, since it uses as much as digits as its factorization.

690889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 690889 is about 831.1973291584. The cubic root of 690889 is about 88.4034931702.

The spelling of 690889 in words is "six hundred ninety thousand, eight hundred eighty-nine".