690049 has 4 divisors (see below), whose sum is σ = 699840. Its totient is φ = 680260.

The previous prime is 690037. The next prime is 690059. The reversal of 690049 is 940096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690049 - 2⁷ = 689921 is a prime.

It is a Duffinian number.

690049 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 689999 and 690026.

It is not an unprimeable number, because it can be changed into a prime (690059) 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, 4789 + ... + 4930.

It is an arithmetic number, because the mean of its divisors is an integer number (174960).

2⁶⁹⁰⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

690049 is a deficient number, since it is larger than the sum of its proper divisors (9791).

690049 is an equidigital number, since it uses as much as digits as its factorization.

690049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9790.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 690049 is about 830.6918803022. The cubic root of 690049 is about 88.3676509196.

Subtracting 690049 from its reverse (940096), we obtain a cube (250047 = 63³).

The spelling of 690049 in words is "six hundred ninety thousand, forty-nine".