394779481 has 2 divisors, whose sum is σ = 394779482. Its totient is φ = 394779480.

The previous prime is 394779409. The next prime is 394779493. The reversal of 394779481 is 184977493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298425625 + 96353856 = 17275^2 + 9816^2 .

It is a cyclic number.

It is not a de Polignac number, because 394779481 - 2¹¹ = 394777433 is a prime.

It is a super-2 number, since 2×394779481² = 311701677237258722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394779181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197389740 + 197389741.

It is an arithmetic number, because the mean of its divisors is an integer number (197389741).

Almost surely, 2^394779481 is an apocalyptic number.

It is an amenable number.

394779481 is a deficient number, since it is larger than the sum of its proper divisors (1).

394779481 is an equidigital number, since it uses as much as digits as its factorization.

394779481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 394779481 is about 19869.0583823190. The cubic root of 394779481 is about 733.5868266663.

The spelling of 394779481 in words is "three hundred ninety-four million, seven hundred seventy-nine thousand, four hundred eighty-one".