38494021 has 2 divisors, whose sum is σ = 38494022. Its totient is φ = 38494020.

The previous prime is 38494009. The next prime is 38494051. The reversal of 38494021 is 12049483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37380996 + 1113025 = 6114^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 38494021 - 2¹⁵ = 38461253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38494051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19247010 + 19247011.

It is an arithmetic number, because the mean of its divisors is an integer number (19247011).

Almost surely, 2^38494021 is an apocalyptic number.

It is an amenable number.

38494021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38494021 is an equidigital number, since it uses as much as digits as its factorization.

38494021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 38494021 is about 6204.3550027380. The cubic root of 38494021 is about 337.6481902497.

The spelling of 38494021 in words is "thirty-eight million, four hundred ninety-four thousand, twenty-one".