3138493 has 2 divisors, whose sum is σ = 3138494. Its totient is φ = 3138492.

The previous prime is 3138491. The next prime is 3138503. The reversal of 3138493 is 3948313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 1172889 = 1402^2 + 1083^2 .

It is a cyclic number.

It is not a de Polignac number, because 3138493 - 2¹ = 3138491 is a prime.

It is a super-2 number, since 2×3138493² = 19700276622098, which contains 22 as substring.

Together with 3138491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3138491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569246 + 1569247.

It is an arithmetic number, because the mean of its divisors is an integer number (1569247).

Almost surely, 2^3138493 is an apocalyptic number.

It is an amenable number.

3138493 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138493 is an equidigital number, since it uses as much as digits as its factorization.

3138493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 3138493 is about 1771.5792389842. The cubic root of 3138493 is about 146.4110049010.

The spelling of 3138493 in words is "three million, one hundred thirty-eight thousand, four hundred ninety-three".