Search a number
-
+
872431 = 7124633
BaseRepresentation
bin11010100111111101111
31122022202021
43110333233
5210404211
630411011
710262350
oct3247757
91568667
10872431
1154651a
12360a67
13247141
14189d27
15123771
hexd4fef

872431 has 4 divisors (see below), whose sum is σ = 997072. Its totient is φ = 747792.

The previous prime is 872429. The next prime is 872437. The reversal of 872431 is 134278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134278 = 267139.

It is a cyclic number.

It is not a de Polignac number, because 872431 - 21 = 872429 is a prime.

It is a super-2 number, since 2×8724312 = 1522271699522, which contains 22 as substring.

It is a Duffinian number.

872431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 872396 and 872405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872437) 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, 62310 + ... + 62323.

It is an arithmetic number, because the mean of its divisors is an integer number (249268).

2872431 is an apocalyptic number.

872431 is a deficient number, since it is larger than the sum of its proper divisors (124641).

872431 is a wasteful number, since it uses less digits than its factorization.

872431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124640.

The product of its digits is 1344, while the sum is 25.

The square root of 872431 is about 934.0401490300. The cubic root of 872431 is about 95.5528612805.

The spelling of 872431 in words is "eight hundred seventy-two thousand, four hundred thirty-one".

Divisors: 1 7 124633 872431