806538390 has 64 divisors (see below), whose sum is σ = 2238921216. Its totient is φ = 182126592.

The previous prime is 806538389. The next prime is 806538419. The reversal of 806538390 is 93835608.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent 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, 5707 + ... + 40566.

It is an arithmetic number, because the mean of its divisors is an integer number (34983144).

Almost surely, 2^806538390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 806538390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1119460608).

806538390 is an abundant number, since it is smaller than the sum of its proper divisors (1432382826).

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

806538390 is a wasteful number, since it uses less digits than its factorization.

806538390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46373.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 806538390 is about 28399.6195397051. The cubic root of 806538390 is about 930.8399510590.

The spelling of 806538390 in words is "eight hundred six million, five hundred thirty-eight thousand, three hundred ninety".