136443990 has 64 divisors (see below), whose sum is σ = 335819520. Its totient is φ = 35468160.

The previous prime is 136443977. The next prime is 136443991. The reversal of 136443990 is 99344631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136443991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 277645 + ... + 278135.

It is an arithmetic number, because the mean of its divisors is an integer number (5247180).

Almost surely, 2^136443990 is an apocalyptic number.

136443990 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 136443990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167909760).

136443990 is an abundant number, since it is smaller than the sum of its proper divisors (199375530).

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

136443990 is a wasteful number, since it uses less digits than its factorization.

136443990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 136443990 is about 11680.9241928882. The cubic root of 136443990 is about 514.8153295213.

It can be divided in two parts, 1364 and 43990, that added together give a palindrome (45354).

The spelling of 136443990 in words is "one hundred thirty-six million, four hundred forty-three thousand, nine hundred ninety".