405012630 has 64 divisors (see below), whose sum is σ = 1082999808. Its totient is φ = 96092160.

The previous prime is 405012581. The next prime is 405012631. The reversal of 405012630 is 36210504.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 405012597 and 405012606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405012631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2454 + ... + 28566.

It is an arithmetic number, because the mean of its divisors is an integer number (16921872).

Almost surely, 2^405012630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405012630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541499904).

405012630 is an abundant number, since it is smaller than the sum of its proper divisors (677987178).

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

405012630 is a wasteful number, since it uses less digits than its factorization.

405012630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26181.

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

The square root of 405012630 is about 20124.9255899246. The cubic root of 405012630 is about 739.8713131472.

The spelling of 405012630 in words is "four hundred five million, twelve thousand, six hundred thirty".