391404045 has 16 divisors (see below), whose sum is σ = 626617152. Its totient is φ = 208625280.

The previous prime is 391404037. The next prime is 391404049. The reversal of 391404045 is 540404193.

It is not a de Polignac number, because 391404045 - 2³ = 391404037 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 22209 + ... + 35721.

It is an arithmetic number, because the mean of its divisors is an integer number (39163572).

Almost surely, 2^391404045 is an apocalyptic number.

It is an amenable number.

391404045 is a deficient number, since it is larger than the sum of its proper divisors (235213107).

391404045 is a wasteful number, since it uses less digits than its factorization.

391404045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15452.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 391404045 is about 19783.9340122232. The cubic root of 391404045 is about 731.4900726829.

The spelling of 391404045 in words is "three hundred ninety-one million, four hundred four thousand, forty-five".