38401813 has 2 divisors, whose sum is σ = 38401814. Its totient is φ = 38401812.

The previous prime is 38401751. The next prime is 38401823. The reversal of 38401813 is 31810483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37051569 + 1350244 = 6087^2 + 1162^2 .

It is an emirp because it is prime and its reverse (31810483) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38401813 - 2²¹ = 36304661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38401823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19200906 + 19200907.

It is an arithmetic number, because the mean of its divisors is an integer number (19200907).

Almost surely, 2^38401813 is an apocalyptic number.

It is an amenable number.

38401813 is a deficient number, since it is larger than the sum of its proper divisors (1).

38401813 is an equidigital number, since it uses as much as digits as its factorization.

38401813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 38401813 is about 6196.9196380137. The cubic root of 38401813 is about 337.3783755629.

The spelling of 38401813 in words is "thirty-eight million, four hundred one thousand, eight hundred thirteen".