390402 has 36 divisors (see below), whose sum is σ = 905814. Its totient is φ = 121440.

The previous prime is 390391. The next prime is 390407. The reversal of 390402 is 204093.

It can be written as a sum of positive squares in only one way, i.e., 385641 + 4761 = 621^2 + 69^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (390407) by changing a digit.

390402 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 17 ways as a sum of consecutive naturals, for example, 9502 + ... + 9542.

2³⁹⁰⁴⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 390402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (452907).

390402 is an abundant number, since it is smaller than the sum of its proper divisors (515412).

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

390402 is a wasteful number, since it uses less digits than its factorization.

390402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 390402 is about 624.8215745315. The cubic root of 390402 is about 73.0865302803.

Adding to 390402 its reverse (204093), we get a palindrome (594495).

The spelling of 390402 in words is "three hundred ninety thousand, four hundred two".