405322890 has 64 divisors (see below), whose sum is σ = 1115541504. Its totient is φ = 92328768.

The previous prime is 405322873. The next prime is 405322909. The reversal of 405322890 is 98223504.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61327 + ... + 67613.

It is an arithmetic number, because the mean of its divisors is an integer number (17430336).

Almost surely, 2^405322890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 405322890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (557770752).

405322890 is an abundant number, since it is smaller than the sum of its proper divisors (710218614).

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

405322890 is a wasteful number, since it uses less digits than its factorization.

405322890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 405322890 is about 20132.6324657259. The cubic root of 405322890 is about 740.0601911108.

The spelling of 405322890 in words is "four hundred five million, three hundred twenty-two thousand, eight hundred ninety".