386981731 has 2 divisors, whose sum is σ = 386981732. Its totient is φ = 386981730.

The previous prime is 386981689. The next prime is 386981741. The reversal of 386981731 is 137189683.

It is a strong prime.

It is an emirp because it is prime and its reverse (137189683) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 386981731 - 2⁹ = 386981219 is a prime.

It is a super-2 number, since 2×386981731² = 299509720255512722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (386981741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193490865 + 193490866.

It is an arithmetic number, because the mean of its divisors is an integer number (193490866).

Almost surely, 2^386981731 is an apocalyptic number.

386981731 is a deficient number, since it is larger than the sum of its proper divisors (1).

386981731 is an equidigital number, since it uses as much as digits as its factorization.

386981731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 386981731 is about 19671.8512346957. The cubic root of 386981731 is about 728.7246958508.

The spelling of 386981731 in words is "three hundred eighty-six million, nine hundred eighty-one thousand, seven hundred thirty-one".