38621389 has 2 divisors, whose sum is σ = 38621390. Its totient is φ = 38621388.

The previous prime is 38621369. The next prime is 38621431. The reversal of 38621389 is 98312683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36542025 + 2079364 = 6045^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 38621389 - 2¹⁵ = 38588621 is a prime.

It is a super-2 number, since 2×38621389² = 2983223376578642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38621309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19310694 + 19310695.

It is an arithmetic number, because the mean of its divisors is an integer number (19310695).

Almost surely, 2^38621389 is an apocalyptic number.

It is an amenable number.

38621389 is a deficient number, since it is larger than the sum of its proper divisors (1).

38621389 is an equidigital number, since it uses as much as digits as its factorization.

38621389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 38621389 is about 6214.6109290928. The cubic root of 38621389 is about 338.0201807448.

The spelling of 38621389 in words is "thirty-eight million, six hundred twenty-one thousand, three hundred eighty-nine".