345621 has 8 divisors (see below), whose sum is σ = 480960. Its totient is φ = 220352.

The previous prime is 345607. The next prime is 345637. The reversal of 345621 is 126543.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 345621 - 2⁹ = 345109 is a prime.

It is an Ulam number.

345621 is a modest number, since divided by 621 gives 345 as remainder.

345621 is a lucky number.

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 345621.

It is not an unprimeable number, because it can be changed into a prime (345601) 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, 2436 + ... + 2573.

It is an arithmetic number, because the mean of its divisors is an integer number (60120).

2³⁴⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

345621 is a deficient number, since it is larger than the sum of its proper divisors (135339).

345621 is a wasteful number, since it uses less digits than its factorization.

345621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5035.

The product of its digits is 720, while the sum is 21.

The square root of 345621 is about 587.8953988594. The cubic root of 345621 is about 70.1778470858.

The spelling of 345621 in words is "three hundred forty-five thousand, six hundred twenty-one".