405625212 has 48 divisors (see below), whose sum is σ = 1055577600. Its totient is φ = 134699760.

The previous prime is 405625193. The next prime is 405625223. The reversal of 405625212 is 212526504.

405625212 is a `hidden beast` number, since 40 + 562 + 52 + 12 = 666.

It is a super-2 number, since 2×405625212² = 329063625220089888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22339 + ... + 36197.

It is an arithmetic number, because the mean of its divisors is an integer number (21991200).

Almost surely, 2^405625212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405625212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (527788800).

405625212 is an abundant number, since it is smaller than the sum of its proper divisors (649952388).

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

405625212 is a wasteful number, since it uses less digits than its factorization.

405625212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14143 (or 14135 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 405625212 is about 20140.1393242450. The cubic root of 405625212 is about 740.2441439369.

The spelling of 405625212 in words is "four hundred five million, six hundred twenty-five thousand, two hundred twelve".