4006436621 has 16 divisors (see below), whose sum is σ = 4526181888. Its totient is φ = 3513369600.

The previous prime is 4006436617. The next prime is 4006436671. The reversal of 4006436621 is 1266346004.

It is a cyclic number.

It is not a de Polignac number, because 4006436621 - 2² = 4006436617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4006436671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87965 + ... + 125501.

It is an arithmetic number, because the mean of its divisors is an integer number (282886368).

Almost surely, 2^4006436621 is an apocalyptic number.

It is an amenable number.

4006436621 is a deficient number, since it is larger than the sum of its proper divisors (519745267).

4006436621 is a wasteful number, since it uses less digits than its factorization.

4006436621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37892.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 4006436621 is about 63296.4187059584. The cubic root of 4006436621 is about 1588.2520539121.

The spelling of 4006436621 in words is "four billion, six million, four hundred thirty-six thousand, six hundred twenty-one".