391404043 has 4 divisors (see below), whose sum is σ = 396916848. Its totient is φ = 385891240.

The previous prime is 391404037. The next prime is 391404049. The reversal of 391404043 is 340404193.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (391404037) and next prime (391404049).

It is a cyclic number.

It is not a de Polignac number, because 391404043 - 2⁹ = 391403531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391404049) 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, 2756296 + ... + 2756437.

It is an arithmetic number, because the mean of its divisors is an integer number (99229212).

Almost surely, 2^391404043 is an apocalyptic number.

391404043 is a deficient number, since it is larger than the sum of its proper divisors (5512805).

391404043 is an equidigital number, since it uses as much as digits as its factorization.

391404043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5512804.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 391404043 is about 19783.9339616771. The cubic root of 391404043 is about 731.4900714370.

The spelling of 391404043 in words is "three hundred ninety-one million, four hundred four thousand, forty-three".