43461990 has 144 divisors (see below), whose sum is σ = 134198064. Its totient is φ = 9694080.

The previous prime is 43461953. The next prime is 43462021. The reversal of 43461990 is 9916434.

43461990 is a `hidden beast` number, since 4 + 34 + 619 + 9 + 0 = 666.

It is a super-3 number, since 3×43461990³ (a number of 24 digits) contains 333 as substring.

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 71 ways as a sum of consecutive naturals, for example, 141417 + ... + 141723.

It is an arithmetic number, because the mean of its divisors is an integer number (931931).

Almost surely, 2^43461990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43461990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67099032).

43461990 is an abundant number, since it is smaller than the sum of its proper divisors (90736074).

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

43461990 is a wasteful number, since it uses less digits than its factorization.

43461990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 43461990 is about 6592.5708187322. The cubic root of 43461990 is about 351.5900174609.

It can be divided in two parts, 4346 and 1990, that added together give a palindrome (6336).

The spelling of 43461990 in words is "forty-three million, four hundred sixty-one thousand, nine hundred ninety".