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690442 = 2345221
BaseRepresentation
bin10101000100100001010
31022002002221
42220210022
5134043232
622444254
75603644
oct2504412
91262087
10690442
11431815
1229368a
131b235c
1413d894
15d9897
hexa890a

690442 has 4 divisors (see below), whose sum is σ = 1035666. Its totient is φ = 345220.

The previous prime is 690439. The next prime is 690449. The reversal of 690442 is 244096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 641601 + 48841 = 801^2 + 221^2 .

It is not an unprimeable number, because it can be changed into a prime (690449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172609 + ... + 172612.

2690442 is an apocalyptic number.

690442 is a deficient number, since it is larger than the sum of its proper divisors (345224).

690442 is a wasteful number, since it uses less digits than its factorization.

690442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345223.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 690442 is about 830.9283964338. The cubic root of 690442 is about 88.3844235913.

The spelling of 690442 in words is "six hundred ninety thousand, four hundred forty-two".

Divisors: 1 2 345221 690442