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2689639 = 10326113
BaseRepresentation
bin1010010000101001100111
312001122111021
422100221213
51142032024
6133352011
731601341
oct12205147
95048437
102689639
111577847
12a98607
13732304
14500291
15381de4
hex290a67

2689639 has 4 divisors (see below), whose sum is σ = 2715856. Its totient is φ = 2663424.

The previous prime is 2689637. The next prime is 2689649. The reversal of 2689639 is 9369862.

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

It is a 10-Lehmer number, since φ(2689639) divides (2689639-1)10.

It is a cyclic number.

It is not a de Polignac number, because 2689639 - 21 = 2689637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2689595 and 2689604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689637) 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, 12954 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (678964).

22689639 is an apocalyptic number.

2689639 is a deficient number, since it is larger than the sum of its proper divisors (26217).

2689639 is a wasteful number, since it uses less digits than its factorization.

2689639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26216.

The product of its digits is 139968, while the sum is 43.

The square root of 2689639 is about 1640.0118902008. The cubic root of 2689639 is about 139.0693200123.

The spelling of 2689639 in words is "two million, six hundred eighty-nine thousand, six hundred thirty-nine".

Divisors: 1 103 26113 2689639