690453 has 6 divisors (see below), whose sum is σ = 997334. Its totient is φ = 460296.

The previous prime is 690449. The next prime is 690467. The reversal of 690453 is 354096.

It is a happy number.

690453 is nontrivially palindromic in base 2.

It can be written as a sum of positive squares in only one way, i.e., 651249 + 39204 = 807^2 + 198^2 .

It is not a de Polignac number, because 690453 - 2² = 690449 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 (690433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38350 + ... + 38367.

2⁶⁹⁰⁴⁵³ is an apocalyptic number.

It is an amenable number.

690453 is a deficient number, since it is larger than the sum of its proper divisors (306881).

690453 is a wasteful number, since it uses less digits than its factorization.

690453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76723 (or 76720 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 690453 is about 830.9350155096. The cubic root of 690453 is about 88.3848929639.

The spelling of 690453 in words is "six hundred ninety thousand, four hundred fifty-three".