405918940 has 36 divisors (see below), whose sum is σ = 991604376. Its totient is φ = 139171872.

The previous prime is 405918937. The next prime is 405918941. The reversal of 405918940 is 49819504.

It is a junction number, because it is equal to n+sod(n) for n = 405918893 and 405918902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405918941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 206122 + ... + 208081.

It is an arithmetic number, because the mean of its divisors is an integer number (27544566).

Almost surely, 2^405918940 is an apocalyptic number.

It is an amenable number.

405918940 is an abundant number, since it is smaller than the sum of its proper divisors (585685436).

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

405918940 is a wasteful number, since it uses less digits than its factorization.

405918940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414226 (or 414217 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 405918940 is about 20147.4301090735. The cubic root of 405918940 is about 740.4227800797.

The spelling of 405918940 in words is "four hundred five million, nine hundred eighteen thousand, nine hundred forty".