690390 has 32 divisors (see below), whose sum is σ = 1841760. Its totient is φ = 184032.

The previous prime is 690377. The next prime is 690397. The reversal of 690390 is 93096.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690397) by changing a digit.

690390 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1009 + ... + 1548.

It is an arithmetic number, because the mean of its divisors is an integer number (57555).

2⁶⁹⁰³⁹⁰ is an apocalyptic number.

690390 is an abundant number, since it is smaller than the sum of its proper divisors (1151370).

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

690390 is a wasteful number, since it uses less digits than its factorization.

690390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573 (or 2567 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 690390 is about 830.8971055432. The cubic root of 690390 is about 88.3822046720.

The spelling of 690390 in words is "six hundred ninety thousand, three hundred ninety".