338994781 has 2 divisors, whose sum is σ = 338994782. Its totient is φ = 338994780.

The previous prime is 338994613. The next prime is 338994787. The reversal of 338994781 is 187499833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203062500 + 135932281 = 14250^2 + 11659^2 .

It is a cyclic number.

It is not a de Polignac number, because 338994781 - 2²⁵ = 305440349 is a prime.

It is a super-2 number, since 2×338994781² = 229834923090475922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338994787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169497390 + 169497391.

It is an arithmetic number, because the mean of its divisors is an integer number (169497391).

Almost surely, 2^338994781 is an apocalyptic number.

It is an amenable number.

338994781 is a deficient number, since it is larger than the sum of its proper divisors (1).

338994781 is an equidigital number, since it uses as much as digits as its factorization.

338994781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 338994781 is about 18411.8109103912. The cubic root of 338994781 is about 697.2646866622.

The spelling of 338994781 in words is "three hundred thirty-eight million, nine hundred ninety-four thousand, seven hundred eighty-one".