690469 has 4 divisors (see below), whose sum is σ = 743596. Its totient is φ = 637344.

The previous prime is 690467. The next prime is 690491. The reversal of 690469 is 964096.

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 214369 + 476100 = 463^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 690469 - 2¹ = 690467 is a prime.

It is a super-2 number, since 2×690469² = 953494879922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

690469 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690467) 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, 26544 + ... + 26569.

It is an arithmetic number, because the mean of its divisors is an integer number (185899).

2⁶⁹⁰⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

690469 is a deficient number, since it is larger than the sum of its proper divisors (53127).

690469 is a wasteful number, since it uses less digits than its factorization.

690469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53126.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 690469 is about 830.9446431622. The cubic root of 690469 is about 88.3855756786.

It can be divided in two parts, 690 and 469, that multiplied together give a triangular number (323610 = T₈₀₄).

The spelling of 690469 in words is "six hundred ninety thousand, four hundred sixty-nine".