393420431 has 4 divisors (see below), whose sum is σ = 400843512. Its totient is φ = 385997352.

The previous prime is 393420407. The next prime is 393420439. The reversal of 393420431 is 134024393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134024393 = 359 ⋅373327.

It is a cyclic number.

It is not a de Polignac number, because 393420431 - 2¹⁰ = 393419407 is a prime.

It is a super-2 number, since 2×393420431² = 309559271056451522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393420394 and 393420403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393420439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3711461 + ... + 3711566.

It is an arithmetic number, because the mean of its divisors is an integer number (100210878).

Almost surely, 2^393420431 is an apocalyptic number.

393420431 is a deficient number, since it is larger than the sum of its proper divisors (7423081).

393420431 is an equidigital number, since it uses as much as digits as its factorization.

393420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7423080.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 393420431 is about 19834.8287363415. The cubic root of 393420431 is about 732.7440545433.

The spelling of 393420431 in words is "three hundred ninety-three million, four hundred twenty thousand, four hundred thirty-one".