690402 has 8 divisors (see below), whose sum is σ = 1380816. Its totient is φ = 230132.

The previous prime is 690397. The next prime is 690407. The reversal of 690402 is 204096.

It is an interprime number because it is at equal distance from previous prime (690397) and next prime (690407).

It is a sphenic number, since it is the product of 3 distinct primes.

690402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (690407) by changing a digit.

690402 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 3 ways as a sum of consecutive naturals, for example, 57528 + ... + 57539.

It is an arithmetic number, because the mean of its divisors is an integer number (172602).

2⁶⁹⁰⁴⁰² is an apocalyptic number.

690402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

690402 is a wasteful number, since it uses less digits than its factorization.

690402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115072.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 690402 is about 830.9043266225. The cubic root of 690402 is about 88.3827167402.

Adding to 690402 its reverse (204096), we get a palindrome (894498).

The spelling of 690402 in words is "six hundred ninety thousand, four hundred two".