136405890 has 128 divisors (see below), whose sum is σ = 385228800. Its totient is φ = 34292160.

The previous prime is 136405877. The next prime is 136405931. The reversal of 136405890 is 98504631.

136405890 is a `hidden beast` number, since 1 + 3 + 640 + 5 + 8 + 9 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 359721 + ... + 360099.

It is an arithmetic number, because the mean of its divisors is an integer number (3009600).

Almost surely, 2^136405890 is an apocalyptic number.

136405890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 136405890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192614400).

136405890 is an abundant number, since it is smaller than the sum of its proper divisors (248822910).

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

136405890 is a wasteful number, since it uses less digits than its factorization.

136405890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 136405890 is about 11679.2932149167. The cubic root of 136405890 is about 514.7674068291.

The spelling of 136405890 in words is "one hundred thirty-six million, four hundred five thousand, eight hundred ninety".