690353 has 4 divisors (see below), whose sum is σ = 730980. Its totient is φ = 649728.

The previous prime is 690341. The next prime is 690367. The reversal of 690353 is 353096.

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 339889 + 350464 = 583^2 + 592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690323) 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, 20288 + ... + 20321.

It is an arithmetic number, because the mean of its divisors is an integer number (182745).

2⁶⁹⁰³⁵³ is an apocalyptic number.

It is an amenable number.

690353 is a deficient number, since it is larger than the sum of its proper divisors (40627).

690353 is a wasteful number, since it uses less digits than its factorization.

690353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40626.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 690353 is about 830.8748401534. The cubic root of 690353 is about 88.3806257576.

The spelling of 690353 in words is "six hundred ninety thousand, three hundred fifty-three".