391461887 has 8 divisors (see below), whose sum is σ = 402591456. Its totient is φ = 380361312.

The previous prime is 391461881. The next prime is 391461911. The reversal of 391461887 is 788164193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 391461887 - 2⁴ = 391461871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391461881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21758 + ... + 35444.

It is an arithmetic number, because the mean of its divisors is an integer number (50323932).

Almost surely, 2^391461887 is an apocalyptic number.

391461887 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

391461887 is a deficient number, since it is larger than the sum of its proper divisors (11129569).

391461887 is a wasteful number, since it uses less digits than its factorization.

391461887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14497.

The product of its digits is 290304, while the sum is 47.

The square root of 391461887 is about 19785.3958009437. The cubic root of 391461887 is about 731.5261043023.

The spelling of 391461887 in words is "three hundred ninety-one million, four hundred sixty-one thousand, eight hundred eighty-seven".