393667690 has 16 divisors (see below), whose sum is σ = 763109928. Its totient is φ = 145354176.

The previous prime is 393667643. The next prime is 393667711. The reversal of 393667690 is 96766393.

It can be written as a sum of positive squares in 4 ways, for example, as 355586449 + 38081241 = 18857^2 + 6171^2 .

It is a super-2 number, since 2×393667690² = 309948500299872200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1513977 + ... + 1514236.

Almost surely, 2^393667690 is an apocalyptic number.

393667690 is a deficient number, since it is larger than the sum of its proper divisors (369442238).

393667690 is a wasteful number, since it uses less digits than its factorization.

393667690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028233.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The square root of 393667690 is about 19841.0607075328. The cubic root of 393667690 is about 732.8975287110.

The spelling of 393667690 in words is "three hundred ninety-three million, six hundred sixty-seven thousand, six hundred ninety".