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391087 = 4753157
BaseRepresentation
bin1011111011110101111
3201212110201
41133132233
5100003322
612214331
73216124
oct1373657
9655421
10391087
11247914
1216a3a7
13109018
14a274b
157ad27
hex5f7af

391087 has 8 divisors (see below), whose sum is σ = 409536. Its totient is φ = 373152.

The previous prime is 391073. The next prime is 391103. The reversal of 391087 is 780193.

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 391087 - 27 = 390959 is a prime.

It is a Duffinian number.

391087 is a lucky number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391057) 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, 2413 + ... + 2569.

It is an arithmetic number, because the mean of its divisors is an integer number (51192).

2391087 is an apocalyptic number.

391087 is a deficient number, since it is larger than the sum of its proper divisors (18449).

391087 is a wasteful number, since it uses less digits than its factorization.

391087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 391087 is about 625.3694907813. The cubic root of 391087 is about 73.1292512200.

The spelling of 391087 in words is "three hundred ninety-one thousand, eighty-seven".

Divisors: 1 47 53 157 2491 7379 8321 391087