354840 has 32 divisors (see below), whose sum is σ = 1064880. Its totient is φ = 94592.

The previous prime is 354839. The next prime is 354847. The reversal of 354840 is 48453.

It is a happy number.

It is a super-2 number, since 2×354840² = 251822851200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 354840.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 354840.

It is not an unprimeable number, because it can be changed into a prime (354847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359 + ... + 1598.

2³⁵⁴⁸⁴⁰ is an apocalyptic number.

354840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

354840 is an abundant number, since it is smaller than the sum of its proper divisors (710040).

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

354840 is a wasteful number, since it uses less digits than its factorization.

354840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971 (or 2967 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 354840 is about 595.6844802410. The cubic root of 354840 is about 70.7963482428.

The spelling of 354840 in words is "three hundred fifty-four thousand, eight hundred forty".