38910989 has 4 divisors (see below), whose sum is σ = 41904156. Its totient is φ = 35917824.

The previous prime is 38910973. The next prime is 38910997. The reversal of 38910989 is 98901983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98901983 = 67 ⋅1476149.

It can be written as a sum of positive squares in 2 ways, for example, as 2102500 + 36808489 = 1450^2 + 6067^2 .

It is a cyclic number.

It is not a de Polignac number, because 38910989 - 2⁴ = 38910973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38910919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1496564 + ... + 1496589.

It is an arithmetic number, because the mean of its divisors is an integer number (10476039).

Almost surely, 2^38910989 is an apocalyptic number.

It is an amenable number.

38910989 is a deficient number, since it is larger than the sum of its proper divisors (2993167).

38910989 is a wasteful number, since it uses less digits than its factorization.

38910989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993166.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 38910989 is about 6237.8673438925. The cubic root of 38910989 is about 338.8629519441.

The spelling of 38910989 in words is "thirty-eight million, nine hundred ten thousand, nine hundred eighty-nine".