393109261 has 4 divisors (see below), whose sum is σ = 410200992. Its totient is φ = 376017532.

The previous prime is 393109243. The next prime is 393109267. The reversal of 393109261 is 162901393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393109261 - 2¹¹ = 393107213 is a prime.

It is a super-2 number, since 2×393109261² = 309069782167932242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393109267) 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, 8545831 + ... + 8545876.

It is an arithmetic number, because the mean of its divisors is an integer number (102550248).

Almost surely, 2^393109261 is an apocalyptic number.

It is an amenable number.

393109261 is a deficient number, since it is larger than the sum of its proper divisors (17091731).

393109261 is a wasteful number, since it uses less digits than its factorization.

393109261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17091730.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 393109261 is about 19826.9831542774. The cubic root of 393109261 is about 732.5508192755.

The spelling of 393109261 in words is "three hundred ninety-three million, one hundred nine thousand, two hundred sixty-one".