355440 has 40 divisors (see below), whose sum is σ = 1102608. Its totient is φ = 94720.

The previous prime is 355427. The next prime is 355441. The reversal of 355440 is 44553.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355441) by changing a digit.

355440 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, 501 + ... + 980.

2³⁵⁵⁴⁴⁰ is an apocalyptic number.

355440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

355440 is an abundant number, since it is smaller than the sum of its proper divisors (747168).

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

355440 is a wasteful number, since it uses less digits than its factorization.

355440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497 (or 1491 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 355440 is about 596.1878898468. The cubic root of 355440 is about 70.8362290243.

Adding to 355440 its reverse (44553), we get a palindrome (399993).

The spelling of 355440 in words is "three hundred fifty-five thousand, four hundred forty".