38001781 has 2 divisors, whose sum is σ = 38001782. Its totient is φ = 38001780.

The previous prime is 38001751. The next prime is 38001811. The reversal of 38001781 is 18710083.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (38001751) and next prime (38001811).

It can be written as a sum of positive squares in only one way, i.e., 24059025 + 13942756 = 4905^2 + 3734^2 .

It is a cyclic number.

It is not a de Polignac number, because 38001781 - 2⁹ = 38001269 is a prime.

It is a super-2 number, since 2×38001781² = 2888270718343922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38001751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19000890 + 19000891.

It is an arithmetic number, because the mean of its divisors is an integer number (19000891).

Almost surely, 2^38001781 is an apocalyptic number.

It is an amenable number.

38001781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38001781 is an equidigital number, since it uses as much as digits as its factorization.

38001781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 38001781 is about 6164.5584594519. The cubic root of 38001781 is about 336.2027929471.

The spelling of 38001781 in words is "thirty-eight million, one thousand, seven hundred eighty-one".