345402 has 24 divisors (see below), whose sum is σ = 773760. Its totient is φ = 111240.

The previous prime is 345379. The next prime is 345413. The reversal of 345402 is 204543.

It is a happy number.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 345402.

It is an unprimeable number.

345402 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 11 ways as a sum of consecutive naturals, for example, 249 + ... + 867.

It is an arithmetic number, because the mean of its divisors is an integer number (32240).

2³⁴⁵⁴⁰² is an apocalyptic number.

345402 is the 372-nd heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 345402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386880).

345402 is an abundant number, since it is smaller than the sum of its proper divisors (428358).

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

345402 is a wasteful number, since it uses less digits than its factorization.

345402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 345402 is about 587.7091117211. The cubic root of 345402 is about 70.1630214090.

Adding to 345402 its reverse (204543), we get a palindrome (549945).

It can be divided in two parts, 345 and 402, that added together give a palindrome (747).

The spelling of 345402 in words is "three hundred forty-five thousand, four hundred two".