405989136 has 60 divisors (see below), whose sum is σ = 1298524032. Its totient is φ = 115996608.

The previous prime is 405989119. The next prime is 405989141. The reversal of 405989136 is 631989504.

It is a happy number.

405989136 is a `hidden beast` number, since 40 + 598 + 9 + 13 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 405989091 and 405989100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200376 + ... + 202391.

Almost surely, 2^405989136 is an apocalyptic number.

It is an amenable number.

405989136 is an abundant number, since it is smaller than the sum of its proper divisors (892534896).

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

405989136 is a wasteful number, since it uses less digits than its factorization.

405989136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402788 (or 402779 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 405989136 is about 20149.1720921729. The cubic root of 405989136 is about 740.4654583229.

The spelling of 405989136 in words is "four hundred five million, nine hundred eighty-nine thousand, one hundred thirty-six".