405345621 has 8 divisors (see below), whose sum is σ = 542019744. Its totient is φ = 269450960.

The previous prime is 405345617. The next prime is 405345631. The reversal of 405345621 is 126543504.

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 405345621 - 2² = 405345617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405345631) 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, 193650 + ... + 195731.

It is an arithmetic number, because the mean of its divisors is an integer number (67752468).

Almost surely, 2^405345621 is an apocalyptic number.

It is an amenable number.

405345621 is a deficient number, since it is larger than the sum of its proper divisors (136674123).

405345621 is a wasteful number, since it uses less digits than its factorization.

405345621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389731.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 405345621 is about 20133.1969890527. The cubic root of 405345621 is about 740.0740253436.

The spelling of 405345621 in words is "four hundred five million, three hundred forty-five thousand, six hundred twenty-one".