351640 has 32 divisors (see below), whose sum is σ = 810000. Its totient is φ = 137344.

The previous prime is 351599. The next prime is 351643. The reversal of 351640 is 46153.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (351643) by changing a digit.

351640 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 7 ways as a sum of consecutive naturals, for example, 2286 + ... + 2434.

2³⁵¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 351640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405000).

351640 is an abundant number, since it is smaller than the sum of its proper divisors (458360).

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

351640 is a wasteful number, since it uses less digits than its factorization.

351640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 351640 is about 592.9924114186. The cubic root of 351640 is about 70.5828879392.

Adding to 351640 its reverse (46153), we get a palindrome (397793).

The spelling of 351640 in words is "three hundred fifty-one thousand, six hundred forty".