393949403 has 2 divisors, whose sum is σ = 393949404. Its totient is φ = 393949402.

The previous prime is 393949399. The next prime is 393949411. The reversal of 393949403 is 304949393.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393949403 - 2² = 393949399 is a prime.

It is a super-2 number, since 2×393949403² = 310392264248112818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (393949603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196974701 + 196974702.

It is an arithmetic number, because the mean of its divisors is an integer number (196974702).

Almost surely, 2^393949403 is an apocalyptic number.

393949403 is a deficient number, since it is larger than the sum of its proper divisors (1).

393949403 is an equidigital number, since it uses as much as digits as its factorization.

393949403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 44.

The square root of 393949403 is about 19848.1586803411. The cubic root of 393949403 is about 733.0723102474.

The spelling of 393949403 in words is "three hundred ninety-three million, nine hundred forty-nine thousand, four hundred three".