405421872 has 40 divisors (see below), whose sum is σ = 1048240944. Its totient is φ = 135024384.

The previous prime is 405421871. The next prime is 405421927. The reversal of 405421872 is 278124504.

It is a super-3 number, since 3×405421872³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (405421871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66838 + ... + 72650.

Almost surely, 2^405421872 is an apocalyptic number.

It is an amenable number.

405421872 is an abundant number, since it is smaller than the sum of its proper divisors (642819072).

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

405421872 is a wasteful number, since it uses less digits than its factorization.

405421872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7277 (or 7271 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 33.

The square root of 405421872 is about 20135.0905634914. The cubic root of 405421872 is about 740.1204284159.

The spelling of 405421872 in words is "four hundred five million, four hundred twenty-one thousand, eight hundred seventy-two".