4038121989 has 18 divisors (see below), whose sum is σ = 6411308358. Its totient is φ = 2447346000.

The previous prime is 4038121987. The next prime is 4038121999. The reversal of 4038121989 is 9891218304.

It can be written as a sum of positive squares in only one way, i.e., 2791325889 + 1246796100 = 52833^2 + 35310^2 .

It is not a de Polignac number, because 4038121989 - 2¹ = 4038121987 is a prime.

It is a super-2 number, since 2×4038121989² = 32612858396090632242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4038121987) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1852962 + ... + 1855139.

Almost surely, 2^4038121989 is an apocalyptic number.

It is an amenable number.

4038121989 is a deficient number, since it is larger than the sum of its proper divisors (2373186369).

4038121989 is a wasteful number, since it uses less digits than its factorization.

4038121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708129 (or 3708115 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 4038121989 is about 63546.2193131897. The cubic root of 4038121989 is about 1592.4280229062.

The spelling of 4038121989 in words is "four billion, thirty-eight million, one hundred twenty-one thousand, nine hundred eighty-nine".