4138621509 has 16 divisors (see below), whose sum is σ = 6022863360. Its totient is φ = 2506984560.

The previous prime is 4138621499. The next prime is 4138621567. The reversal of 4138621509 is 9051268314.

It is not a de Polignac number, because 4138621509 - 2¹⁷ = 4138490437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4138621709) 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, 36534 + ... + 98040.

It is an arithmetic number, because the mean of its divisors is an integer number (376428960).

Almost surely, 2^4138621509 is an apocalyptic number.

It is an amenable number.

4138621509 is a deficient number, since it is larger than the sum of its proper divisors (1884241851).

4138621509 is a wasteful number, since it uses less digits than its factorization.

4138621509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63560.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 4138621509 is about 64332.1187976892. The cubic root of 4138621509 is about 1605.5305368511.

The spelling of 4138621509 in words is "four billion, one hundred thirty-eight million, six hundred twenty-one thousand, five hundred nine".