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2638290 = 23587943
BaseRepresentation
bin1010000100000111010010
311222001001110
422010013102
51133411130
6132314150
731265544
oct12040722
94861043
102638290
111542206
12a72956
13714b25
144c9694
15371ab0
hex2841d2

2638290 has 16 divisors (see below), whose sum is σ = 6331968. Its totient is φ = 703536.

The previous prime is 2638271. The next prime is 2638297. The reversal of 2638290 is 928362.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 87943 = 2638290 / (2 + 6 + 3 + 8 + 2 + 9 + 0).

It is a d-powerful number, because it can be written as 27 + 64 + 312 + 87 + 213 + 92 + 0 .

It is not an unprimeable number, because it can be changed into a prime (2638297) 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, 43942 + ... + 44001.

It is an arithmetic number, because the mean of its divisors is an integer number (395748).

22638290 is an apocalyptic number.

2638290 is an abundant number, since it is smaller than the sum of its proper divisors (3693678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2638290 is a wasteful number, since it uses less digits than its factorization.

2638290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87953.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 2638290 is about 1624.2813795645. The cubic root of 2638290 is about 138.1786176911.

The spelling of 2638290 in words is "two million, six hundred thirty-eight thousand, two hundred ninety".

Divisors: 1 2 3 5 6 10 15 30 87943 175886 263829 439715 527658 879430 1319145 2638290