690040 has 32 divisors (see below), whose sum is σ = 1673280. Its totient is φ = 254592.

The previous prime is 690037. The next prime is 690059. The reversal of 690040 is 40096.

690040 = T₁₁₂ + T₁₁₃ + ... + T₁₇₆.

It is a happy number.

690040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (52290).

2⁶⁹⁰⁰⁴⁰ is an apocalyptic number.

It is an amenable number.

690040 is an abundant number, since it is smaller than the sum of its proper divisors (983240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690040 is a wasteful number, since it uses less digits than its factorization.

690040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351 (or 1347 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 690040 is about 830.6864631135. The cubic root of 690040 is about 88.3672667381.

The spelling of 690040 in words is "six hundred ninety thousand, forty".