393749 has 2 divisors, whose sum is σ = 393750. Its totient is φ = 393748.

The previous prime is 393739. The next prime is 393761. The reversal of 393749 is 947393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208849 + 184900 = 457^2 + 430^2 .

It is a cyclic number.

It is not a de Polignac number, because 393749 - 2¹⁶ = 328213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196874 + 196875.

It is an arithmetic number, because the mean of its divisors is an integer number (196875).

2³⁹³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

393749 is a deficient number, since it is larger than the sum of its proper divisors (1).

393749 is an equidigital number, since it uses as much as digits as its factorization.

393749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 35.

The square root of 393749 is about 627.4942230810. The cubic root of 393749 is about 73.2947983953.

The spelling of 393749 in words is "three hundred ninety-three thousand, seven hundred forty-nine".